Re: DSLR/PC plateau?

2004-01-14 Thread Pieter Nagel
On Wed, Jan 14, 2004 at 10:01:21AM -0800, Chaso DeChaso wrote:
 
 I think the above analysis is overly reliant on the
 idea of the job as equivalency to 35mm (or Med Format)
 traditional film photography - equivalency in a
 variety of ways including not only resolution and such
 things.
 
 One quick example would be when something happens
 (relatively soon) such as sensors becoming not only
 way higher in resolution but also much more
 light-sensitive than film.  Among other things, this
 would allow both digital-only (non optical) zoom and
 total depth of field.

Now how, in the Holy Name of Optics, would one achieve Total Depth of
Field just because the medium is digital?

Or do you mean something more mundane, that a more light-sensitive medium
allows for a smaller aperture than otherwise?

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Re: version 1.1

2004-01-09 Thread Pieter Nagel
John Francis said:

 Pretty much exactly what I predicted would be the best we could hope for,
 back when the camera was first released.  I'm favourably impressed;  while
 it was apparent that these capabilities were technically feasible, I still
 thought that the hyper manual stop-down metering was too much to expect.

I find it interesting that they chose to address M-lens compatibility with
new firmware *first*, of all the other potential things they could have
done.

They could have, say, added flashing red blown highlights, which would
seem to be of value to a wider audience. It does seem that they realised
that a large number of (potential) *istD owners value their old lenses.

For me, the fact that they issued a firmware update at all makes me more
confident that they might issue a next one later, maybe adding blown
highlight indication then and histogram on instant review then.

But I also wanted M-lens compatibility *first* :-)


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Solution to Pentax eyecup loss

2004-01-09 Thread Pieter Nagel
On Tue, Jan 06, 2004 at 11:48:28PM -0500, Stan Halpin wrote:
 
 I would like a viewfinder eyecup that stays in place.

The solution to this notorious Pentax ailment is simple:

Wrap a 5-7mm wide rubber band around the eyecup. This keeps the eyecup in
place, and protects the diopter slider from accidental movement (which can
cause the dreaded Why can't I manual-focus today? condition). 

For optimal aesthetics with black cameras, go to an eletronic components
shop and ask for a black rubber drive belt as close as possible to the
desired size.

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Re: Solution to Pentax eyecup loss

2004-01-09 Thread Pieter Nagel
On Fri, Jan 09, 2004 at 01:08:40PM -0500, Bill Owens wrote:
 
 I used a blue rubber band to match the blue icons on the ist D  8-)

That's wrong. You should use a green rubber band to match the green icons.

Blue icons are relevant during preview only; it's the green icons that
make shooting easier for dummies who keep using their eyecups.

I mean, we must be doing something wrong to lose the eyecups; if they were
really loose Pentax would've picked it up in QA years ago.

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Re: Thanks for the Welcome!

2004-01-04 Thread Pieter Nagel
On Sat, Jan 03, 2004 at 11:43:28AM -0800, Jasmine wrote:
 
 One thing I would like to get is a flash-thingy.  Are they hard to 
 find?  Expensive?  (and yes, I said flash-THINGY - I have a fine command 
 of the English language, thank you very much!)

You already received a lot of good advice.

I would only add that you hold back on buying a flash-thingy until you've
got a good grip on taking photographs using only the light that you have
available in the scenery.

I have an ulterior motive, of course: once you understand natural light, I
hope that you would also respect and appreciate it more, making you less
likely to want to go and fry the Holy Baloney out of it with a Big Honking
Raygun.

As you can see, I don't much like the indiscriminate use of flash. 

Flash is a tool, mostly used as a weapon that makes one look more flashy
and professional, and to scare your subjects into blinded submission and
approriate awe of one's photographic talents. 

Some people also use flash as a means of carrying a kind of virtual bubble
of boring, head-on, miner's headlamp frontal white lighting around with
them, so as to make all there photographs appear to be taken in the same
surroundings.

And a smaller minority use flash, intelligently and judiciously, as a way
to subtly enhance the light or make a photograph possible in a situation
where they otherwise would not have been able to take one.

But that intelligence and judicion builds on experience of just what
possibilities the light that is there offers them, so start there.

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Re: Some waaaaay cool photos

2004-01-04 Thread Pieter Nagel
On Sun, Jan 04, 2004 at 03:56:09PM -0500, Mark Roberts wrote:
 Taken by a robot on Mars!
 http://www.jpl.nasa.gov/mer2004/rover-images/jan-04-2004/images-1-4-04.html

Its mission is to find life, right?

They should have send Lewis the robot photographer we discussed a while
ago. That robot was designed to seek out life. And it composes its
pictures better.

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Re: Evening / night photography

2004-01-02 Thread Pieter Nagel
On Fri, Jan 02, 2004 at 12:15:41PM +0200, Naomi van der Lippe wrote:
 Hi Bob
 
 The last photographs I did in the dark (of which one succeeded) I used your
 everyday Kodak gold and it was 200 ASA.  I have heard the higher the speed
 of the film, the better your chances of taking successful photo's.  (Any
 suggestions are welcome).  

I'm not Bob but I'll answer anyway.

For indoor shots without flash, photos of musicians performing in a dimly
lit venue, street scenes etc. higher speed film is recommended, It allows
one to still hand-hold the camera in situations where one otherwise could
not, allowing for more nimble action photography.

For Gauteng Province nighttime street photography, I recommend carrying a
tripod or monopod with a heavy cast-iron head, for fending off muggers.

Higher speed film is recommended in the dark, even when using flash. Esp.
smaller flashed can not illuminate every part of the scene. On a slow
film, the background and nooks and crannies might render black, whereas
with a faster film the ambient light on the surroundings might be
sufficient to also render them visible even if they weren't flash-lit.

Personally, though, I detest the reflixive, habitual usage of flash just
because it is supposedly dark. Night-time scenery has a light quality
all of its own that is different from sunlit scenes and which creates a
mood all of its own. Using flash (esp. full-frontal camera-mounted flash)
destroys the special nighttime ambiance, and replaces it with a
deer-caught-in-the-headlights miner's-headlamp-lit quality that can make
the most special night-time occasion seem to have occured in some
windowless living room at noon.

Another crucial tool for night-time photography is fast lenses. I started
out using older manual lenses, and to my mind a maximum aperture of f/2.0
is OK, f/1.4 is fast and f/2.8 and slower is getting a bit of dog,
because it is a zoom lens. But looking at consumer zooms, a maximum
aperture of f/5.6 seems more like the average.

Your depth of field will be shallow at a wider-open aperture, but this
also fits in with the mood of how we percieve night-time scenes: at
night, the world consists of lots of seperately lit islands, we do not
perceive both the people close to us and the scenery far away in focus at
night, either.

My personal thing at the moment is available light shots of dancers on
the dance floor at nightclubs. These places are often very dark, the
ambient light is not sufficient even at f/1.4 @ 3200 ISO. On the other
hand, they have strobe lights going off about every 1/4 second, which one
can think of as camera flashlights mounted all over the ceiling that you
can't control. So a lot of my recent photopgraphy is done at 3200 ISO at
f/1.4 and 1/4 or 1/3 second, handheld (the strobe light freeze the
motion). I get a lot of flops this way, were the strobe light did not go
off during the exposure and the photo is way too dark, or where the strobe
light went off twice at people half four arms and legs each, or where, due
to the long exposure, stationary ambient lights like red LED's on a DJ's
mixing console totally burn and overexpose.

But the point is, even with the flops, that the photos preserve more of
the mood and the natural (ahem) light of that scene than everybody else
with theire big honking flashbulbs that transform any nightclub to look
like somebody's cocktail party in Joe's apartment.

More relevant for *you*, nighttime photography might take you into a range
of film speeds, or apertures, or shutter lenghts, that feel weird to you.
Get used to it.

 I am thinking of taking photo's of the moon (I purchased a 500 mm lens),
 subjects in front of the moon with parts of the moon shining through (bare
 tree branches, etc); 

This changes things. The moon itself is a sun-lit object, and apparently
the same f/16 sunny rules of thumb for daytime exposures work well when
shooting the moon itself.

That means, thought, that there is a high contrast between the moon and
the bare tree branches you are speaking of. Either you will get the
texture and craters on the moon in your photo, and the branches black
silhouettes; or the moon will be an overexposed white disk with detail in
the tree.

 moving vehicle lights;

Depends on how much you want the vehicle lights to streak. Do you want a
single car's taillights to streak a short red streak all starting and
ending in the same photo, or do you want the entire road to be traced in a
filligree of red and white lines?

In either case, just set your aperture and shutter so that the
lamp-lit surroundings are darker than the midtones (say 1 stop
underexposed). Now look at your shutterspeed. Say it is 1s. How far will
the average car in your scene move in one second?Enough? Too much? Make
your aperture 1 stop smaller and your shutterspeed twice as long (or the
opposite), until your shutterspeed feels right.

Oh, and don't be afraid to bracket extensively, esp. if this is your first
time.

 the stars when in the 

Re: Evening / night photography

2004-01-02 Thread Pieter Nagel
On Fri, Jan 02, 2004 at 12:22:14PM +0200, Naomi van der Lippe wrote:

 Re the stars photo - I would love to be able to recreate photo's where the
 shutter stays open for a period of time with the starts creating almost a
 circle effect.

If you actually *want* the starts to streak and circle, I would recommend
using a slow film and narrow aperture so that you are forced to have a
long exposure. You will need a cable release that clicks in position and
keeps the shutter open until you release it, because we are talking about
at least a 20min long exposure here.

The stars seem to wheel around the poles, so get an astronomy website or
Voortrekker scout guide to explain to you how to find the South pole in
the sky from the Souther cross. The stars will circle around that, so keep
that somewhere in your photo.

Also, try and find reciprocity failure information on the film you will be
using, with such long exposures. And try and protect the camera from stray
light from campfires and such that will occur while you sip your whisky
in the desert and wait for the photo to finish.
you will leave your camera 

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Re: Evening / night photography

2004-01-02 Thread Pieter Nagel
On Fri, Jan 02, 2004 at 12:53:20PM -0500, tom wrote:

 I think I took this with a pz-1p and 20-35/4, probably shot on Delta
 3200 at 1600 at f/4. I would guess from the light trails the shutter
 speed is about 1/30. I just rested the camera on a ledge, set the
 camera in AV mode and bracketed. Bright point source lights like this
 will often make the meter overexpose.
 
 http://www.bigdayphoto.com/cityscapes/power_authority_0731.htm

I like this shot. It has... power. The weight of the building lends it...
authority.

No seriously, I like it. :-)

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Re: Evening / night photography

2004-01-02 Thread Pieter Nagel
On Fri, Jan 02, 2004 at 01:18:15PM -0500, Christian wrote:
 
 - Original Message - 
 From: tom [EMAIL PROTECTED]
 
  I think Peter covered things pretty well, but here are some examples
  of night shotsthese were done way back in the day.

[snip]

 Tom Van Veen is no longer allowed to post photos to this list.  He's giving
 me an inferiority complex!

[snip]

 Oh, wait a minute, he is human after all!

Don't worry, Thom is not infallible: He misspelt my name wrong. 

Usually I just let it slide, but with a surname of Dutch origin it is
unforgivable that Thom van Vien should get my name wrong.

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Re: Photodisks Failing

2004-01-02 Thread Pieter Nagel
On Fri, Jan 02, 2004 at 12:42:50PM -0500, Ann Sanfedele wrote:

 I think paper and film are a lot easier to care for and handle than discs...
 I need them to be because I'm such a klutz.

Despite having recently embraced an *istD, I must say this for film:

One day when I'm old and gray and doddering, no matter what happens, no
matter what image file formats are patented or whether the last 50
terrabit Selenium Memory Pin reader in the world gives up the ghost; worst
comes to worst, I can always hold my negatives up to the light. 

And since it is unlikely that technology like magnifying glasses and other
lenses will become obsolete, worst will not come to worst.

And even if Digital should be replaced by Quantum Imaging, I can at least
take a Quantum image of my negative and reverse the colours in
PhotoGalaxy.

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Re: Photodisks Failing

2004-01-02 Thread Pieter Nagel
On Fri, Jan 02, 2004 at 12:46:00PM -0600, Chris Brogden wrote:

[snip]

 People argue against digital archiving by bringing up the longevity of
 glass plates, daguerrotypes, dried beaver skins, etc.,

Beaver skins? Hah! 

And if your CD's should fail, could you at least *wear* them in the
winter, huh?

:-)


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Re: Photodisks Failing

2004-01-02 Thread Pieter Nagel
On Sat, Jan 03, 2004 at 11:11:12AM +1000, Rob Studdert wrote:
 On 2 Jan 2004 at 20:47, Pieter Nagel wrote:
 
  And even if Digital should be replaced by Quantum Imaging, I can at least
  take a Quantum image of my negative and reverse the colours in
  PhotoGalaxy.
 
 However you might not see much. A lot of my dads colour negs from the '60-'70 
 don't even contain enough data to make a crude BW print these days.

Ah, but it is *Quantum* imaging I am talking about... :-)

Ok. So I overestimate the average longevity of negatives. So I'm left with
saying, er, that it is easier to accidentally delete a digital picture
than a frame from a negative, yup, that's the ticket.

But honestly, it's actually just that I *like* the physicality of the film
medium, despite being a professional computer programmer (or maybe,
because of it). Storing an image using a 2D grid of molecules of varying
densities feels just so, well, elegant and simple. Maybe because molecules
don't crash and have bugs as often.

That said, despite knowing that the fast majority of my photography
henceforth will be digital. I have a sneaky suspicion that a lot of my
future film work will be with the LX, due to the OTF metering, of a future
foray into medium format.

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Re: Solar filter (was Re: Multiple exposure shot over course of the year)

2004-01-01 Thread Pieter Nagel
On Thu, Jan 01, 2004 at 07:19:31AM -0500, Herb Chong wrote:
 did you make it yourself or is it designed for photographic use? i know B+W
 makes a 20 stop filter, but i don't know if that alone makes it useful for
 solar work.

I think a 20 stop filter would be dangerous to use for solar photgraphy.
It might block 20 stops of visible light, but let through enough other
wavelengths to fry your eye through the viewfinder. Even if you can't see
the sun at all.

I would strongly discourage anyone from using any filter for solar
photography unless the filter is explicitly designed as a *solar* filter,
not just a very dark filter.

As to the original question on solar filters without colour casts:

I once was given a piece of solar filter that looked just like very thin
aluminium foil. It was a sheet of metal manufactured so thin that it
became transparent enough for solar viewing. The image through this was
noticably whiter than through another Mylar (?) filter, whose image was
more muddy and yellow.

Unfortunately, I do not remember the make. I suggest you ask at a place
that sells telescopes.

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Re: Solar filter (was Re: Multiple exposure shot over course of the year)

2004-01-01 Thread Pieter Nagel
On Thu, Jan 01, 2004 at 04:59:14PM +0100, Anders Hultman wrote:

 My filter is from such a place, but your tip is useful anyway: 
 Thinking about it now, I might find a better filter by looking again. 

This might be useful:

http://www.baader-planetarium.com/sofifolie/details_e.htm

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Re: AP liked the *ist 35mm best

2004-01-01 Thread Pieter Nagel
On Thu, Jan 01, 2004 at 12:32:53PM -0800, Bruce Dayton wrote:
 I don't think that it is targeted at all those who still have pre 'A'
 lenses.  Those people generally like the LX, MX, SuperProgram era
 bodies as well as the lenses.

This statement doesn't quite make sense to me.

It's not just people who own older bodies which are conteporaneous with
the older lenses who know of the lense' existance. 

Even someone whose first Pentax body was a recent MZ-whatever could still
see old second hand K lenses on the shelves, buy them, and expect them to
work as well in their *istD as they did in their MZ-5 or MZ-S.

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Re: For Sale - 2004 January 1

2004-01-01 Thread Pieter Nagel
On Thu, Jan 01, 2004 at 04:33:18PM -0800, Bucky wrote:
 I have an SMC Pentax-M 50mm 1:1.4 for sale.  If anyone on the PDML is
 interested, you get first shot, otherwise I'll eBay it.

H. My favourite lens. If I didn't already have one, I'd have bought
it.

What? You're *selling* it? What kind of monster *are* you???

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Re: Multiple exposure shot over course of the year

2003-12-31 Thread Pieter Nagel
On Wed, Dec 31, 2003 at 09:05:18AM +1000, Tanya Mayer Photography wrote:
 Ok, guys, maybe this is the inexperience coming out in me again, BUT, I
 don't get this photo.  Technically, how is it possible?  I mean if those
 shots truly showed the sun, then how did it manage to show it as a perfect
 little circle with no flare/rays etc?

AFAIK, the guy shot one exposure to get the foreground. The rest of the
exposures, of the sun. were done with a solar filter, small f-stop and
fast shutter, so the light from the foreground scenery as insufficient to
exposure the film.

Other than that no manipulation was done.

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Re: another istD issue

2003-12-29 Thread Pieter Nagel
On Mon, Dec 29, 2003 at 10:27:59AM +, mike wilson wrote:
 space race apochrypha
 
 Americans spend millions of dollars developing a pen that will write in
 zero gravity.  Russians issue cosmonauts with pencils.
 
 /space race apochrypha

An urban legend. Apparently both countries started off using pencils in
space, and both switched to pens because pencils are a hazard; the
graphite breaks off, floats about and can short electrical contacts.

http://www.snopes.com/business/genius/spacepen.asp

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Re: Manual Lens on Pentax ist D

2003-12-29 Thread Pieter Nagel
On Mon, Dec 29, 2003 at 12:46:39PM -0500, Christian wrote:

 Would it work in Av mode?

In Av mode the *istD does not stop down the lens, even if you did dail an
aperture smaller than wide open.

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Multiple exposure shot over course of the year

2003-12-29 Thread Pieter Nagel
Here's something cool: a single frame of film shot with 38 multiple
exposures during the course of the year:

http://antwrp.gsfc.nasa.gov/apod/ap030320.html

It shows loopy-8 course the sun takes over the course of the year.

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Re: OT: Best photography novel?

2003-12-29 Thread Pieter Nagel
The Last Magician by Janette Turner Hospital has as one of its main
characters a photographer named Charlie Chang, the last magician of the
book's title.

As I remember the book, Chang's photography obsessively spirals around
something hidden in his  the main character's past, thereby finally
illuminating it.

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Re: Dynamic Range

2003-12-29 Thread Pieter Nagel
On Mon, Dec 29, 2003 at 07:35:16PM -0500, Herb Chong wrote:
 did you shoot in RAW? if you did, you could convert to TIFF with exposure
 compensation of -1 and gotten more out of the *istD. that's how the camera
 works and one of the reasons why i shoot RAW unless i have no choice. it
 gives me one more stop to play with before the highlights saturate.

Yes, I did, I always do.

If I wasn't shooting RAW, the highlights would have saturated at 255, and
not at 4095, as I said.

I'm not sure whether RAW actually gives you one more stop of dynamic
range/sensor acceptance range. That might be an impression created by the
Pentax software, which I do not use (I use Linux, dcraw, cinepaint, and
gimp 1.3).

It is plausible that, when shooting JPG, that the JPG is derived from the
entire dynamic range of the RAW (i.e. RAW 0 - 4095 is mapped to 
JPG 0 - 255) - but of course there are less gradations of tonality
inbetween in the JPEG. I think the black point and the white point of the
JPEG are chosen based on a combination of thumbsuck, heuristics, the shape
of your histogram, and your contrast setting, and it need not be true that
there is an extra stop available either below the black or above the white
of your JPEG. Sometimes, but not always.

However, even in those cases, should you choose to only use the rightmost
2/3 range of your exposure, you can do that with RAW and it's finer
gradation of tonality, without posterisation.

How does the RAW - JPEG conversion of the Pentax software compare to what
happens in-camera? If it is similar, I could do some experiments to see
exactly how the dynamic range of the RAW and the JPEG relate.

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Re: Japanese FAQ on *ist D

2003-12-22 Thread Pieter Nagel
On Mon, Dec 22, 2003 at 07:26:33PM +0100, Frits Wüthrich wrote:
 From the website below: The RCR-V3 charge pond does not use, with
 respect to voltage characteristic, the male is completed.
 
 the male is completed.: I am not so sure I understand this.

I guess it either means Buy a Pentax and enjoy status and sex appeal,
or The protrutriding battery pin is the positive terminal.

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Re: Japanese FAQ on *ist D

2003-12-22 Thread Pieter Nagel
On Mon, Dec 22, 2003 at 09:04:26PM +0200, Pieter Nagel wrote:
 On Mon, Dec 22, 2003 at 07:26:33PM +0100, Frits Wüthrich wrote:
  From the website below: The RCR-V3 charge pond does not use, with
  respect to voltage characteristic, the male is completed.
  
  the male is completed.: I am not so sure I understand this.
 
 I guess it either means Buy a Pentax and enjoy status and sex appeal,
 or The protrutriding battery pin is the positive terminal.

Er, I meant protruding. 

Although I must admit, protrude-riding has potential as a new word.

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Re: *istD crashed like Windoze!

2003-12-21 Thread Pieter Nagel
On Sat, Dec 20, 2003 at 09:43:05PM -0600, William Robb wrote:
 
 - Original Message - 
 From: Pieter Nagel
 Subject: *istD crashed like Windoze!

  In the end I had to take out the batteries and reinsert to wake it up.
 
 I've had that happen twice so far, also when reviewing files.

Maybe there's a pattern to this.

In my case I was shooting a burst of long exposure shots with noise
reduction, until the buffer was full, then pressed the review button,
waited quite a while for the hourglass to disapear, and then pressed
left. The camera froze on me after displaying the previous picture, one
of the burst of pictures that the camera was still processing when I
pressed the review button the first time.

Related in any way to what happened in your case?

So, when's the new firmware coming out? :-)

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Re: Re[2]: Santa Pics

2003-12-19 Thread Pieter Nagel
On Fri, Dec 19, 2003 at 12:05:37PM +, [EMAIL PROTECTED] wrote:
   My question still stands:
   Is it better to slightly underexpose on the DSLR?
  
   -- 
   Best regards,
   Bruce
 I think so Bruce.You have a better chance to fixup an underexposed than 
 over,or so
 i've 
 been told by those in the know.

A dissenting voice:

http://luminous-landscape.com/tutorials/expose-right.shtml

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Re: Re[2]: Santa Picsy

2003-12-19 Thread Pieter Nagel
On Fri, Dec 19, 2003 at 07:20:42PM -0500, Herb Chong wrote:
 you don't understand the assertion nor the article. they are saying the same
 thing. don't overexpose in digital.

The article says: get as close as you can to overexposing, cause that is
good, but don't burn out the highlights, cause that is very bad. 

Other people in this thread said; burning out the highlights is very bad,
so stay as far away as you can from the highlights, and rather underexpose
to avoid burning them.

Is that a fair summary? And they are not saying the same thing?

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Re: OT:Inkjet printer recommendations

2003-12-18 Thread Pieter Nagel
On Thu, Dec 18, 2003 at 06:39:10AM -0500, Herb Chong wrote:
 newer Epson printers track the amount of ink in the cartridge in the
 cartridge itself.

Actually the cartridges don't really sense how much ink is really there.
They just have a simple counter that gets decreased proportionate to how
much ink the printer thinks its using.

Of course, Epson would rather have the cartridge show empty when there's
some ink left, instead of running out of ink when it shows some ink
left. Less nasty surprises for the user that way (and more regular ink
purchases, too...)

One can buy resetters that reset the cartridges to showing full, which
allows one to print until they are *really* empty - but one still doesn't
know when it will *really* run empty.

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Re: *istD and prime lens aperature

2003-12-17 Thread Pieter Nagel
On Tue, Dec 16, 2003 at 06:27:38PM -0600, William Robb wrote:

 From: Pieter Nagel 

  Oh, I wasn't hoping to get any more quality out of the tiny APS sensor
  with 2/3 faked colour. 
 
 I presume you have an ist D? 
 If so, you know how wrong this statement is.

I did not mean that as a slur on the istD specifically, I was referring to
the difference between film  current CCD's in general.

Specifically, I was referring to the fact that each pixel of the CCD has a
red, green or blue filter and can detect only one of the three, the other
two need to be interpolated, ergo. 2/3 faked colour.

I do not ascribe mystical properties to digital imaging algorithms just
because digital is supposedly always better than analog. Therefore,
even though I concede that the interpolation of the colours might in
practice work fine, I do not for any moment believe that the interpolation
algorithm can always end up with the colour value the pixel would have had
if it had been able to sense the other two colours.

Yes, I have an istD, and I am quite happy with the colour - although I
must add that I have only had it for a few days now.

But I can't help wondering (as a theoretical curiosity) how much better
the colour rendition would be if each pixel could sense red, green and
blue simultaneously. Users of a Foveon chip could comment.

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Re: *istD and prime lens aperature

2003-12-17 Thread Pieter Nagel
On Wed, Dec 17, 2003 at 10:11:19AM -0800, Bruce Dayton wrote:

 One thing you are not factoring in to this issue is the output side.
 When the output is digital, you have the same basic problem.  Each
 pixel is only one color.

Just because, at the output side, printers need to dither dots on paper
to create colors, does not mean that any penalties you paid at the input
side are irrelevant. It's like saying printing enlargements magnifies
grain anyway, so there's not so much benefit in using finer-grained film
over coarse-grained film as you'd think.

Dithering means the printer has to make compromises to try and reach the
colour you want at a point. If you add uncertainty about *which* colour it
should try to reach into the mix (like with an interpolated Bayer-matrix
CCD), things get worse.

 I believe digital mini-labs do this.  So in fact, the color doesn't
 have to be faked as much as it has to be patterned.  The downside to
 this is that certain patterns (especially man-made) could come out
 looking wrong.  The natural random nature of film grain tends to hide
 this rather than accentuate it.

Film, with its pixels all a mix of random sizes and shapes, distributed
randomly, even over and behind each other, has a huge advantage over
digital due to this. 

I don't think the naively religious digital crowd realizes this. Sometimes
I hear of someones who scans a negative, sees (they think) the first film
grain, and then concludes that any higher resolution scan of the film is
therefore fruitless. They don't seem to realize there's smaller grains yet
to be resolved, after the first big one's they thought you saw.


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Re: *istD and prime lens aperature

2003-12-17 Thread Pieter Nagel
On Wed, Dec 17, 2003 at 04:52:13PM -0700, John Mustarde wrote:
 On Wed, 17 Dec 2003 23:16:56 +0200, you wrote:
 snip
 ... then concludes that any higher resolution scan of the film is
 therefore fruitless. They don't seem to realize there's smaller grains yet
 to be resolved, after the first big one's they thought you saw.
 
 Wow. More grain. Just what I wanted. Can't wait to resolve right down
 to the atoms. Bet film has more atoms than digital, too.

This is what I find fascinating - the idea that the grain is an absolutely
irrelevant detail divorced from the image, when in fact the grains are the
one and only embodiment of the image.

It is the fact that that large film grain is actually a cluster of smaller
grains, or not, which adds finer tonal information. It's not the grains
themselves I want to see; just the finer shades of gray they embody. The
atoms are the image; up to a reasonable point.


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Re: *istD and prime lens aperature

2003-12-16 Thread Pieter Nagel
On Mon, Dec 15, 2003 at 01:36:51PM -0500, graywolf wrote:

 Everything else the same, a larger format give 
 better quality. The question is, if you need that quality why are you using 
 a small format camera in the first place. If you don't, why worry about it.

Oh, I wasn't hoping to get any more quality out of the tiny APS sensor
with 2/3 faked colour. I was just amusing myself with the theory, trying
to come up with as many contributing factors as possible.

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Re: *istD and prime lens aperature

2003-12-14 Thread Pieter Nagel
On Mon, Dec 15, 2003 at 09:41:18AM +1000, Rob Studdert wrote:

 No, you are simply looking at a cropped area of the image projected by any 
 lens.

What effect does this have on the look of the lens, other than the
apparent change of focal length?

Astigmatism and distortion are worse towards the edges of the image. but
the CCD excludes the edges of the sensor. So on the one hand it would seem
that lenses may perform better. On the other hand, the resulting image
must be magnified even more to do the same size print, so the lesser
distortion at the edges of the CCD may end up looking as bad after
magnification.

This is a re-delurk, after about a year of-list that also coincided with a
photography hiatus I intend to end.

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*istD hot pixels at 3200 ISO

2003-12-14 Thread Pieter Nagel
I checked out a *istD on Saturday. I took a photo with the lenscap on and
a fast shutterspeed, and it had 3 hot pixels at ISO 3200, none at 200.
Another *istD had 2 or 3 hot pixels at ISO 1600.

Am I just unlucky, or do I have naïve expectations about digital cameras,
or am I a walking source of electromagnetic interference?

Do any of the *istD owners on this list have a flawless CCD? 

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RE: DSLR Pricing (was: RE: Today's rant: Alright, already

2002-08-21 Thread Pieter Nagel

On Thu, 2002-08-22 at 00:06, Cotty wrote:
 Pieter, you got a coffee table?? Does it have nice strong legs??

I used to have one, until it broke.

I've been contacted by certain other camera manufacturers and we decided
to make 35mm cameras more attractive to rich young men by introducing
the icon of a supine nude next to the traditional tulip, mountain and
running man on the exposure dial. The marketing campaign is: when she
sees you cannon, she'll pose.

To field test this combination, I've invited a lot of tulips, running
men and supine nudes to lie on my coffee table while photographing them.
My coffee table simply gave in under the weight.

Coinciding with the release of this camera, Fuji will announce the
extension of the venerable Velvia, Superia and Provia lines with the new
Fuji Pornia slide film, featuring enhanced skintone and pink
sensitivity.

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Re: Pentax and the joyful absence of exposure modes

2002-08-20 Thread Pieter Nagel

On Tue, 2002-08-20 at 23:03, Mishka wrote:
 there're tons of other variables in play: the duration of
 exposure, the depth of field, and so on, and on, and on. that's why
 there're all those nd filters, multiple exposures, and so on. 

I think you misread my original message: I wrote that I was deliberately
ignoring tons of other variables, like these.

Variables like fascination with a certain subject and preference for a
certain type of film are chosen in one's head. There's no camera knob
for any of them.

However, the moment it actually comes to lifting the camera to one's
eyes and taking the photo, shutter speed and aperture are, for me, the
major remaining artistic choices I have to make where the camera
interface comes to play. For choosing where to point the camera and how
to frame the subject I use my muscles, not camera knobs.

So, my point was: the pentax modeless interface nicely focusses one's
attention, when dealing with the camera, one two of the major variables
where the camera actually is relevant - and those variables are few,
compared to the vastness of psychological variables.
 
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Re: MZ-S appearance handling vs. PZ-1p (was: MZ-S built quality)

2002-08-20 Thread Pieter Nagel

On Tue, 2002-08-20 at 22:56, Robert Soames Wetmore wrote:

 Well, that's if a camera is primarily an object of contemplation or 
 perception, rather than something to be handled.

There's an interesting article by DA Norman, author of The Design of
Everyday Things at http://www.jnd.org/dn.mss/Emotion-and-design.html.
He argues that attractive things work beter. (This from an author who
used to be accused of elevating function of aesthetics).

Basically, one's emotional state has a huge impact on how one uses a
tool. If one is stressed, one focusses better, but also less likely to
be creative, and more likely to trip over idiosyncracies in the
interface. If one is in a good mood, one is more creative in one's use
of the tool, and more likely to forgive their ideosyncracies.

Quotable quote: Wash and polish your car: doesn't it drive better?

The point, for me? Liking the feel of a camera, PS-1p or MZ-S, may be
just as important an interface feature as, say, shutter lag and
placement.

But we all knew that already :-)

 
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Re: Next Pentax Flagship Camera?

2002-08-18 Thread Pieter Nagel

On Sun, 2002-08-18 at 23:50, Cameron Hood wrote:

 If I had a digital camera, it could all be archived for easy retrieval
 on CD alphabetically, by date, by scene, by subject, or all of the above,
 instantly, and repeatably.

Archivability is the major reason why I'm still shooting film.

I don't do photography for a living, so every photograph I shoot for
myself. I want to be able to look back over my life and development as
photographer even when I'm 90 years old in a rocking chair.

With film I know I can at least look at the negatives with a loupe, if
enlarging and scanning is no longer available in future.

I have computer diaries from 1995 which are lost to me because the CD-R
is no longer readable.

I'm a computer geek, but I prefer the tangibility of film over digital,
for now.

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Re: South African Pentaxers: are you also struggling to get Pentax goods?

2002-08-16 Thread Pieter Nagel

On Wed, 2002-08-14 at 15:06, MZ3_fella _ wrote:
 I'm really surprised that you've had trouble getting products - the S.A 
 distributor, ISO PHOTO has twice won the Pentax Distributor of the Year 
 Award, based largely on astounding market shares.

The are doing very well at pushing point-and-shoot cameras through
minilabs, apparently. Its the more professional dealers and gear that 
seem to be neglected.


Anyway, having complained publically, I should publically state that I
finally got an order for five eyecups placed yesterday, much to the
surprise of the dealer who phoned and thought it would be a
demonstration of how impossible it is to get anything out of ISO Photo.

Maybe I'll be drowned in eyecups soon, if ISO Photo suddenly woke up and
starts processing all my attempts to get eyecups last year.

In that case, maybe it'll be me that ends up mailing eyecups to PUGers
in need, instead of the other way around :-)

Next month's article: pictures on my website on how to fix Pentax
eyecups so that they do not get lost in the first place? Lets hope.
 
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RE: South African Pentaxers: are you also struggling to get Pentax goods?

2002-08-13 Thread Pieter Nagel

On Tue, 2002-08-13 at 21:58, Glen O'Neal wrote:

 It seems to me with all our friends on the PDML, one of us should be able to
 order anything you need and ship it to you.

Wow, thank you. I will keep that in mind if I don't manage.

But my goals are more long-term: I want to shake some sense into the
local distributors. I've been trying to order a 77/1.8 for over a year,
but am reluctant to sink money into my Pentax gear if I can't even
depend on them for replacement parts.

Imgine going to various camera shops every month for a year, asking
them: 
  Have you got my eyecups yet? 
  Nope, the rep says Pentax forgot to order them again. 
  Oh. Any price on a 77/1.8 yet
  Nope, the distributors never phoned back. The guy I spoke to last
didn't even know such a thing existed
  Oh. Did you get that Pentax camera case for that dentist yet?
  Nope. No response from Pentax the past two years.

Sheesh!

Every night I tuck my cameras in bed as if they're orphans in an
orphanage, or refugees or something :-)
 
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RE: South African Pentaxers: are you also struggling to get Pentax goods?

2002-08-13 Thread Pieter Nagel

On Wed, 2002-08-14 at 00:44, Rob Studdert wrote:

 It used to be quite similar here in Oz, it's not so bad now though, but there 
 are still a few big gaps, keep going hard at the retailers and if you have no 
 joy call the distributors yourself and make waves there.

It the *distributors* that are the problem! Every single authorised
Pentax retailer in my region complains that the sole distributor fails
to supply them with stock!
 
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Re: Pentax and the amateur market (WAS: PMA News)

2002-02-22 Thread Pieter Nagel

On Thu, Feb 21, 2002 at 01:54:12PM +0100, P?l Audun Jensen wrote:
 Jow wrote:
 
 They have captured the amature market through
 the mz series like no other company has.
 
 But that's in Australia (and reportedly South Africa).

I can confirm about the MZ series in South Africa. For The past few years
I've noticed that a lot of SLR shooters I meet up with use MZ cameras,
MZ-30 and such, I think. To such an extent, that I sometimes wondered why
PDMLers keep moaning that the rest of the world is all Canon and Nikon.

My informal sample is limited to bands and music festivals, though. 

But then we are a weird country. Electrolux's slogan over here *is*
Nothing sucks like Electrolux, for example.

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Re: Am I Really a Dinosaur?

2002-02-17 Thread Pieter Nagel

On Sat, Feb 16, 2002 at 12:54:41PM -, Frits J. W?thrich wrote:
 100 lines per millimetre is 25.4 x 100 is 2540 lines per inch. Is it OK to
 say that this could be translated to 2540 ppi, or do I miss something here?

100 lines per millimetre refers too 100 lines high density *and* the gaps
of low density inbetween. So you need to sample 200 lines per millimetre
to capture both the lines and the gaps inbetween.

This is not enough. Imagine the image you are trying to scan is offset
exactly half a line with the CCD, so that each of the scanner pixels sees
exacyly half a black and half a white line. You would scan a sheet of
perfect gray. All the detail would be lost.

So you need to sample at at least 400 lines per millimetre to get all the
detail. This is a well-known aspect of sampling theory - you need to
sample at twice the frequency of the signal you want to capture. This is
why audio CD's sample sound at 44KHz - the highest pitch the human ear can
hear is about 22KHz.

That means we need to scan at 10160 ppi to capture all the detail from an
ideal fine-grained negative that resolves 100 lines per mm.

Still this is not the end. This far we assumed that film grain is regular
and rectangular, like pixels. It isn't. Film grains come in various shapes
and sizes. And they are laid out in a random pattern, not a regular grid.

Whether this means that we have to scan at an even higher resolution than
10160 ppi I do not know. I do know that the mismatch between a rectangular
grid of even-sized CCD elements and a random array of variable-sized film
grains can yield a nasty phenomenon called grain aliasing at around 2900
dpi, and that scanning at a higher resolution is the only cure.

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Re: PUG: beyond cameras

2001-09-10 Thread Pieter Nagel

On Wed, 5 Sep 2001, John Mustarde wrote:

 On Tue, 4 Sep 2001 15:11:05 +0200 (SAST), you wrote:
 
 With all the local brouha about what constitutes a Pentax users, I
 began wondering why this list is photography-centric? Pentax makes
 more than just cameras after all?
 
 
 Troll, troll, troll. But a good troll.

Actually not a troll. I've honestly been curious about the non-camera
activities of Pentax, and hoped to elicit some discussion from people
who have experience using, say, Pentax surveying equipment.

 BTW, any idea how the fungus got in your endoscope?

Been using a N autoclave to sterilise it too long.

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Manual focus feel of 77 1.8 Limited?

2001-08-30 Thread Pieter Nagel

I'm strongly considering to get myself a 77 1.8 ltd. I would
appreciate some info on it, since local Pentax didn't even seem to
know it existed before I started asking about it. 

One crucial aspect to me, other than its availability in black :-)
is: what does it feel like to manual focus? How does its MF compare
to, say, a 50mm 1.4? How big is the throw on the focus ring? How well
is it damped? Does the front rotate as you focus or not?

And since I do a lot of low-light high-contrast stage shots: how
effective is its' built-in hood? How far does the hood project before
the front element? Is it circular or one of those cutesy tulip shaped
ones that are totally inappropriate to primes?

There are none in the country, so I'll have to have it imported and
I'd hate to inconvenience them by returning it due to design flaws I
could have found out about here.

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RE: painted Pentax

2001-08-22 Thread Pieter Nagel

On Sat, 18 Aug 2001, Paul M. Provencher wrote:

 I have two black cars, prefer my black suits, and don't own anything but
 black shoes.  It's a personal preference.

Which is why I wish they'd bring out black Ltd lenses instead. A
black MZ-S and black 77 1.8 Ltd would be my ideal tools for shooting
Gothic bands and people in dark Gothic clubs.

As someone said earlier, the silver lenses scare off the wildlife...

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Re: Why I won't be buying an MZ-S, and other ramblings with a rantat the very end.

2001-07-18 Thread Pieter Nagel

On Wed, 18 Jul 2001, Jaros³aw Brzeziñski wrote:

 cameras that come in the way of your photographic view. If you own an 
 old all-manual camera, you need to focus on technics: how to get 
 focusing and metering right, instead of zeroing-in on your subject. 
 With modern cameras you concentrate on the vision and let the device 
 compute the distance and exposure.

The distance and the exposure is dependent on your vision. Is it the
distance to the highlight in the girl's eye or to the cigar in the
tycoon's mouth that your vision demands of the device to compute? Do
you want the device to compute the exposure for the trashcan in the
shadow or the exposure for the sunlit cracks of wall paint?

With all-automatic cameras, you are forever unsure whether the
device's heuristics are in synch of your vision, and therefore are
perpetually worrying about technicalities all the MORE. Working
manually, you simply say what you mean.

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Re: Help to an IR-newbie?

2001-07-09 Thread Pieter Nagel

Jostein Oksne [EMAIL PROTECTED] wrote:

 5. When I handle the film in the darkroom; is the emulsion sensitive to body
 heat, eg. from my hands when reeling up the film on a spool?

Only if your hands are on fire.

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Re: A clue to the flash-impaired?

2001-07-04 Thread Pieter Nagel

On Tue, 3 Jul 2001 [EMAIL PROTECTED] wrote:

 I've been using my ZX-M for about six months.  On a recent vacation I took
 some photos in extreme, almost overhead, sunlight.  I did what I could when
 composing to try and get the sun behind me, but... let's just say the photos
 are less than what I'd hoped for.  Lots of shadows on the subjects' faces...
 some of them are very underexposed as well (the landscape looks great,
 though!).

I don't think you need to use flash at all. Camera-mounted flash can
make photos look dull and flat. Natural light is more interesting.

It sounds as if the landscape in your photos was significantly
brighter than your subjects, and dominated the scene, thereby
dominating your lightmeters average reading. You could using over
exposure compensation - effectively telling the camera I want the
scene brighter than *you* think it should be, because I know these
small darker shapes here are more important than the average
landscape, dammit!

One thing flash *will* remove is the shadows that strong overhead
light casts on faces from noses, eyebrows and other protrubrances.
But often there are other, more interesting ways to get rid of those. 
Hve them stand near a bright, reflecting wall. Under trees that
diffuse the sunlight. etc.

PS: I don't know where the sun must be behind the photographer rule
comes from, but I think its junk. It makes people squint. It gives
flat light. Try having the sunlight come in from an angle, to the
side.

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Re: MZ-S gripes

2001-06-12 Thread Pieter Nagel

On Sun, 10 Jun 2001, [iso-8859-1] Pål Jensen wrote:

 Mark wrote:
 
 
  Absolutely. Seeing an LED bargraph go up for overexposure and down for
  underexposure just plain makes sense.
 
 But the point wasn't if it makes sense isolated. But whether it
 makes sense in conjunction with its control dial which goes left
 right. For me at least, theres no logic direction for a
 left/right wheel in order to make, say, the scale go up.

Since one can reach the wheel from the front and back of the camera,
turing it left from the back side is the same as turning it right from
the front, and vice versa. So there would be confusion with a
left/right exposure display too.

If you turn the wheel left/right, either one or the other sides of
the wheel is going down. Choose a side which feels more important
to you and then if its up/down doesn't coincide with the exposure
up/down, use the Pentax functions to reverse the direction you need
to turn the dial so it makes sense to you.

Personally, I prefer a vertical lightmeter display.

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Re: OT: seeking advice on shooting a live music show in a bar.

2001-06-04 Thread Pieter Nagel

On Fri, 1 Jun 2001, [iso-8859-1] Hernán Mouro wrote:

 Pieter Nagel wrote:
 
  2) Spot meter. Read the light of the musicians skin...

 2a) Does this apply to portraits in general?

I would say so - the people are the focus of the shot - unless your
goal is to get all the detail of the black stitching in their dark
clothes and don't care that the faces are overexposed to the heavens.

 2b) So I measure the light of the musicians skin and just shoot? Is skin
 lighter
 than middle grey?

My gut feel goes with Aaron's, that caucasian skin is roughly one
stop brighter than middle grey.

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Re: OT: seeking advice on shooting a live music show in a bar.

2001-06-04 Thread Pieter Nagel

On Sat, 2 Jun 2001 [EMAIL PROTECTED] wrote:

 [EMAIL PROTECTED] writes:
 
  This may sound a really silly few questions, but I've
  never seen a monopod. I realise it has one leg, but
  how do you hold it steady? And when is it better than
  a tripod? Is it as steady as a tripod? What does it
  look like?  

 You provide the support that is missing from the other two legs.
 You hold it as steady as you can, but it is never steadier than a tripod.

You can easily get a steady shot with a monopod at about 1/15, maybe
1/8. But by that time it's already too slow: if you're shooting
musicians, you get motion blur from their antics on stage.

So the regions where a tripod is more stable than a monopod (the
world of exposures slower than 1/15) is totally useless when shooting
action anyway, and therefore a tripod never gets to realize is
advantages over a monopod in those situations, and you're much better
of with a lighter, less cumbersome support anyway.

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Re: What happened... to PDML and PUG?

2001-06-04 Thread Pieter Nagel

On Sun, 3 Jun 2001, [iso-8859-1] Eduardo Carone Costa Júnior wrote:

 Perhaps I'm just getting a little nervous. It seems that, the more I learn
 about photography, the worse my photos get... Had anyone felt like this
 before?

I find that with all forms of creativity.

What happens is that your ambitions and conceptions of what you
*could* do grow faster than your abilities do. You are actually
getting better and better, but your standards are growing faster yet.

It's a sign of growth. If your abilities catch up with your ambition,
you've stagnated.

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Re: OT: seeking advice on shooting a live music show in a bar.

2001-06-01 Thread Pieter Nagel

I've been shooting a lot of bands lately. Here's my advice:

1) Try to check out the bar's stage lighting before the event. In
general, stages tend to be darker than one expects, so use faster
film and shorter, faster lenses. Stage lights tend to create more
contrast than illumination.

2) Spot meter. Read the light of the musicians skin and work from
that. Don't rely too much on an average reading since the scene is
likely to be contrasty, as I said. If you expose for an average
reading, the musicians under the lights will be overexposed.

3) If the lights are fairly static, it works to take a few good
ambient readings of the subjects before all the action starts, and
just stick, and concentrate on getting the decisive moment. With
light from the top, the light reflecting from the musician's faces
should be more or less the same from different angles, although the
average reading will vary wildly.

4) Monopod is good. Tripod is likely to be useless.

5) You may need to reconcile yourself too larger apertures than you
are used to.

6) Mike stands are evil. Once you start shooting the band, you'll see
what I mean. Watch the musicians for manerisms which you can learn to
anticipate. Musicians often step back from the mike stand during
specific parts of a song, like musical interludes, giving you a clear
shot. You will see many such photographical opportunities repeat
themselves in coincidence with the song structure.

7) Don't drop the camera from your eyes in between songs. Lots of
photographic opportunities then. Remember, you're photographing their
show, not making an audio recording.

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Re: Check out the Pentax Japan site...slight change...

2001-05-14 Thread Pieter Nagel

On Sat, 12 May 2001, [iso-8859-1] Hernán Mouro wrote:

 PS: in the specifications page I found: Shutter: Electronic control type
 traversing line  mosquito Lu plane shutter

That feature was requested by African safari photographers. It's a
special mode in which you hang the camera, with mirror locked up,
back open, and lens detached from the roof of your tent at night. The
camera continuously recharges the flash and the buzzing sound
attracts mosquitoes. If the musquito flies in from the lens flange
side, a modification of the predictive autofocus system estimates
when the mosquito will traverse the shutter plane, at which point the
shutter closes - chop! Like a guilotine.

It only reduces the risk of malaria by 0.75%, but hey, that's
something.

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Re: Cokin filters

2001-03-28 Thread Pieter Nagel

On Tue, 27 Mar 2001, Bob Blakely wrote:

 Cokin filters suck canal water. Compared to even a cheap, screw in glass filter, 
they are
 sharpness reducing, contrast destroying, dispersion generating flair intensifiers.

Flair intensifying? So all the glamour photographers use Cokin, then?

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Re: Best shot you _know_ you missed (WAS: What do you shoot)

2001-03-16 Thread Pieter Nagel

[EMAIL PROTECTED] wrote:
 
 Why can't the camera be designed to lock the shutter if the film breaks?
 That way, it's not up to you to notice the Error display. DOES the shutter
 lock? If so, that would make me feel much better about moving to a modern
 camera.

When my MZ5n detected misloaded film, it not only locked the shutter,
the viewfinder indications refused to light as if it were off instead
of on. The moment you lift that camera to your eyes you know
something is wrong.

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Re: MZ-S - PZ1-p successor?

2001-03-14 Thread Pieter Nagel

On Tue, 13 Mar 2001, John Francis wrote:

 That's wrong.   The second (small) p in PZ-1p stands for 'panoramic'.
 That's one of the features that differentiates the PZ-1p from the PZ-1.

So what does the small n in MZ-5n stand for? The two big differences
between MZ-5 and MZ-5n are panorama mode and DOF preview, and neither
conjure up anython vaguely N-ish in my head.

MZ-5 "new"?

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