In critical work such as with motion picture transparency film, the eye can
detect as little as 1/10 a stop difference between scenes. With negative films
you can adjust in the printing stage so they are not so critical. And, if you
are not showing them side by side no one will notice.
--graywolf
The physical size of the lens depends on a lot of things, but the f-stop is
determined by the ratio of the size of the diaphragm opening to the focal
length. In fact if you look at your lens it says exactly that. 1:2.0 50mm, which
is just another way of saying the diaphragm openning is 1/2 the foc
Actually, it is do to the increase in focal length at closer distances. For
example, a 50mm f2.8 macro stretchs to 100mm when it is focused at 1:1, and
becomes an f5.6. We usually ignor this fact and just say you need to open it up
two stops at 1:1, but that is just a convient rule of thumb.
--gra
Well now we get to talk about t-stops.
T-stops are based on the amount of light transmitted through the lens. That
controls exposure. Before TTL metering was common lenses used for critical
purposes, usually feature motion picture use where each scene had to match the
other scenes exactly, the be
Ahh, well--if you are going to buy the wrong tool for the job, half-price
is quite a bargain.
Dan Scott
[EMAIL PROTECTED]
Scooterman wrote:
>I'd been using the full-tilt ver of Paint Shop pro for abt a year.
>It replaced the FREE copy of ver 3.1 (that actually works just peachy)...
>actually,
> Based on my experience, I would say that the button may be gibbled rather
> than pooched. ;>)
>
> (Winnipeg English, I think)
>
> John Poirier
In either case, you are farfolen.
Jeff
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In a message dated 9/24/01 9:08:18 PM Central Daylight Time,
[EMAIL PROTECTED] writes:
<< > "Hinky" is a new one on me, though. Methinks it originates somewhere
west
> of Mississaugua. :-)
>
Ya, Bill is a Gaucho from the Canadian Pampas.
Jeff >>
I thought he was a lumber jack, like i
- Original Message -
From: "William Robb" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: September 24, 2001 6:48 PM
Subject: Re: Super Program/A problems
>
> Yer shutter button is hinky. Does the meter shut off? If so the
> first position is good and the second position is bad. If not
I just sent out the confirmations for the upcoming gallery. If
you don't get a confirmation, it may be because your email link
was not filled in. Of course, it may also be because you didn't
submit an image, in which case you are a big poopie and don't
need to read this anyway.
If you submitted an
> "Hinky" is a new one on me, though. Methinks it originates somewhere west
> of Mississaugua. :-)
>
Ya, Bill is a Gaucho from the Canadian Pampas.
Jeff
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vi
- Original Message -
From: <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, September 24, 2001 3:44 PM
Subject: Re: constant aperture zooms
> In a message dated 9/24/01 2:17:36 PM !!!First Boot!!!,
[EMAIL PROTECTED]
> writes:
>
> << Constant aperture zooms are very nice for fill
- Original Message -
From: "Pål Jensen" <
Subject: Re: lens brightness
> Bob wrote:
>
> > Now, tell me how interchangeable lenses are used along with
those fancy hand held light meters. When you take out your
Pentax Spot Meter, do you adjust it every time you put a
different lens on the
A couple of questions concerning this unit.
1) What are the recycle times with fresh batteries from a full-power
discharge?
2) Can you use NiMH batteries?
3) Aprox how many discharges can you get from a fresh set of batteries?
Thanks!
Nick
-
This message is from the Pentax-Discuss Mail List.
- Original Message -
From: <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, September 24, 2001 11:35 AM
Subject: Re: lens brightness
> OK folks, I hear what you are saying.
>
> Now, tell me how interchangeable lenses are used along with
those fancy hand held light meters. When
Hi, Jeff,
I'm in TO too, and I (and my circle of acquaintances) use "pooched" all
the time.
"Hinky" is a new one on me, though. Methinks it originates somewhere west
of Mississaugua. :-)
-frank
Jeff wrote:
> Hinky? Pooched? Wow, and I thought my Canadian was odd.
>
--
"The optimist thin
- Original Message -
From: "Shel Belinkoff"
Subject: Re: lens brightness
> Ivan Prenosil wrote, re effective lens aperture:
>
> > It can't be (as people sometimes say on this list) as simple
as
> > lens diameter divided by focal length; otherwise my
FA28-70/4
> > could not be constant ap
> With some of the most avid Pentax users here in the U.S. and
> elsewhere, I wonder why a setup like this wouldn't be offered
> outside of Japan? Jim A.
I think the Japaness companies have a tendency to test the market
for new products in Japan, before they put them on other markets,
perhaps eve
Hinky? Pooched? Wow, and I thought my Canadian was odd.
Jeff, from Toronto.
- Original Message -
From: "William Robb" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, September 24, 2001 8:48 PM
Subject: Re: Super Program/A problems
> - Original Message -
> From: <[EM
I'm just having a hard day an' I'm constipated.
Regards,
Bob...
---
"In the carboniferous epoch
we were promised perpetual peace.
They swore if we gave up our weapons
that the wars of the tribes would cease.
But when we disarmed they sold us,
and delivered us, bound, t
- Original Message -
From: <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, September 24, 2001 3:06 PM
Subject: Super Program/A problems
> Hi all
> My much appreciated Super A behaves funny: The shutter fires
as soon as I advance the film, without pressing the release
button!
Y
My 280T quit working. Don't know why.
If anyone wants one to repair, $20.
I'll pay US shpg. Any EE out there
want a project?
Collin
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
<>< <>< <>< <>< <>< <>< <>< <>< <>< <>< <>< <><
-
This message is from the Pentax-Discuss
>From: [EMAIL PROTECTED]
>To: [EMAIL PROTECTED]
>Subject: Re: constant aperture zooms
>Date: Mon, Sep 24, 2001, 4:44 PM
>
> I'm sure this is self-explanatory to most of you, but not to me. ."the
> background will tend to stay at the same density".. Why?
"Density" in this reference refers to
Bob Blakely wrote:
> Thank you for failing to properly attribute
> quotes. - and this from a group that is
> probably zealous about copyrights and proper
> tribulation of their photo work!
>
> Sheesh!
Sorry Bob, from work thru AOL Anywhere Mail, quoting is a miserable task - PITA. I
appreciate
>Exactly. My stepbrother asked me the other day to help him figure out why
>his iMac would only send B&W to his color HP printer. I figured I'd start
>by examining his printer drivers, but do Macs even use printer drivers as I
>know them? Where on earth would they be? Where's the right mouse b
The difference among f/stops on modern lenses with excellent coatings is (supposedly)
exceptionally small. Some zoom lenses may show differences when used with slides and
compared side to side with primes by someone with an exceptionally critical eye, I
suppose. I'll bet that even this us usually
In a message dated 9/24/01 2:17:36 PM !!!First Boot!!!, [EMAIL PROTECTED]
writes:
<< Constant aperture zooms are very nice for fill flash, even with
auto everything cameras, as the background will tend to stay at
the same density, no matter what focal length you are shooting
at. >>
I'm sure
i have that tokina 19-35 lens and i like a lot. i shot a wedding two
weeks ago and they put togeather two groups of relatives that a 28 mm
would not work.the 19-35 sure came in handy.
Received: from smtpin-101-6.bryant.webtv.net (209.240.198.40) by
storefull-162.iap.bryant.webtv.net with WTV-SM
Hi John and ...
I don't have the MZ-S (yet), but: Does this mean we can practice flash comp. without
the new, MZ-S-dedicated flash?
Photodane
>
> Fra: John Hiben <[EMAIL PROTECTED]>
> Dato: 2001/09/24 Mon AM 08:01:22 CEST
> Til: [EMAIL PROTECTED]
> Emne: MZ-S Flash Expousre compensation
>
> He
Hi all
My much appreciated Super A behaves funny: The shutter fires as soon as I advance the
film, without pressing the release button!
Have anyone experienced anything like that.
Can this be caused by a faulty battery - I have just replased it.
Answers wil be greatfulle apreciated!
Photodane
Shel wrote:
> Since I use rangefinder cameras, hand-held meters, and even cameras
> with non-ttl metering, and the exposures are correct regardless of how
> I meter, and regardless of which lenses I use, how might that be
> explained?
It can only be explained with that you're not very critical
Bob wrote:
> Now, tell me how interchangeable lenses are used along with those fancy hand held
>light meters. When you take out your Pentax Spot Meter, do you adjust it every time
>you put a different lens on the camera? Oh, the T-value for that lens is 1/2 stop
>better than this one?
> (I'm
John wrote:
> Whilst reading through the archive i came across this post in regards to flash
>exposure compensation on the MZ-S, if i was going to use the flash for fill flash,
>would I dial in + or - exposore compensation?
>
About -1.5 stops should do the trick.
Pål
-
This message is fro
The sigma APO is, if only just a bit.
--- [EMAIL PROTECTED] wrote:
> In a message dated 9/24/01 5:09:36 PM !!!First
> Boot!!!, [EMAIL PROTECTED]
> writes:
>
> << I'm considering the Sigma or Tamron 70-300 lens
> and
> not ever handling a lens like I come to y'all
> asking for your opinions. >>
Its not just Pentax, they all have problems under the
circumstances you describe.
William Robb
- Original Message -
From: "john vanderaalst" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, September 24, 2001 10:44 AM
Subject: Noise and the Pentax EI-2000
> Hi,
>
> I'm looking a
Sorry Dave, it just hit a raw nerve... :0)
I pride myself in being an engineer although of course my qualifications say
I am a scientist. I practice good engineering discipline over my work, and
guard the use of the term software engineer by those who do indeed engineer
software, as opposed to th
In a message dated 9/24/01 5:09:36 PM !!!First Boot!!!, [EMAIL PROTECTED]
writes:
<< I'm considering the Sigma or Tamron 70-300 lens and
not ever handling a lens like I come to y'all asking for your opinions. >>
Just curious. Are these lenses very much better than the Pentax FA 80-320?
Phylli
The world's twenty-four time zones used to be labeled alphabetically ( a
military thing, I believe), A through Z, omitting I and O.
Len (in the US Air Force from 1956 through 1979)
---
- Original Message -
From: "Cotty" <[EMAIL PROTECTED]>
To: "Pentax List" <[EMAIL PROTECTED]>
Sent: Frida
On Mon, 24 Sep 2001, Chris Brogden wrote:
>That might have something to do with lens-to-film distance. Maybe the
>smaller mount doesn't need as large an opening because it's closer to the
>film plane than the K-mount? (Total guess) That being said, it happens
[...]
No guess at all. Did every
Wow! The ink cartidges must be huge! Gallon-sized?
Len
---
- Original Message -
From: "Aaron Reynolds" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, September 21, 2001 12:11 PM
Subject: Re: Reply Part III: Confessions of an old timer
> Well, with Epson, the only line div
Mick Maguire writes:
> Electrical / Electronic I see, perhaps you should take up whether Software
> engineers are real engineers with the IEEE Dave, they certainly seem to
> think so.
I am not arguing that. My statement was tongue-in-cheek (or foot-in-mouth
perhaps). I've done both hardware
Shel Belinkoff wrote:
[snip]
> ...I've noticed that newer lenses transmit more light than some
> older lenses, due in part, I'm sure, to the coatings used. F2.8 seems
> to be the same for all my newer lenses, but F2.8 is a little
> underexposed with some earlier lenses.
One of the American ma
Right.
And closely related to the info from Wheatfield Willie given earlier, f-stops are
computations of DOF. On many medium format cameras, esp. those with bellows focusing,
you'll see a scale on the side which instructs the user regarding exposure and focus
distance. Look at a photo of the
Hi,
I noticed the same thing today. Few days ago I bought M42 > Kmount
adapter to enable the recently acquired screw mount SMC Takumar
3,5/28. Just today I met with a friend who owns Carl Zeiss Jena
135/3.5 lens (which was made for Practica cameras and has M42 mount)
with intention to compare
Yes - for current coated & multicoated lenses it usually is marginal - 33% (!)
difference is the smallest that the film is able to record. With your dad´s old lenses
you have to do like the photographers of old: test.
All the best!
Raimo
Personal photography homepage at http://personal.inet.fi/p
Actually the focal length increases - physically - as you crank the lens out when
focusing closer. That´s why the f-stop and focal length are correct only at infinity.
All the best!
Raimo
Personal photography homepage at http://personal.inet.fi/private/raimo.korhonen
-Alkuperäinen viesti
Ivan Prenosil wrote, re effective lens aperture:
> It can't be (as people sometimes say on this list) as simple as
> lens diameter divided by focal length; otherwise my FA28-70/4
> could not be constant aperture zoom :-)
Hi ...
Like you, I don't believe it's as simple as diameter/focal length,
Rob Brigham wrote:
>
> Unless you set the aperture from the body - then you will know the
> aperture!
...except I can't do that with my LX, ME Super or 67. And yes, there
are zooms for the 67 (two of 'em!). :)
-Aaron
-
This message is from the Pentax-Discuss Mail List. To unsubscribe,
go to
Electrical / Electronic I see, perhaps you should take up whether Software
engineers are real engineers with the IEEE Dave, they certainly seem to
think so.
Regards,
/\/\ick...
++
||
__/) Mick Maguire |
| Email:
Yes.
Note: The lenses of almost all motion picture cameras use T-stops (measure
of light transmission). At one time in the industry, before the excellent
coatings of today and when the lenses of these cameras were mounted on
turrets, there could be a significant difference between an f/stop and a
Hello all,
I was at a friend's wedding in the Thousand Islands over the weekend
(it's a beautiful area, close to my alma mater as well) and shot a
couple rolls of NPH during the ceremony and reception (it was an outdoor
wedding, thankfully the sun came through for us). I thought it would be
a
- Original Message -
From:
Subject: Re: lens brightness
> > I have heard remarks that a 200/2.8 prime will transmit more
> > light than an 80-200/2.8 zoom. Is this true? I thought a
> > 200/2.8 was a 200/2.8 whether it be a prime or part of a
zoom.
> > Thanks for any help.
>
> I'm with y
On Mon 2001-09-24 (15:33), HUDERER Bernd wrote:
> Nowadays with automatic cameras constant aperture zooms got rare.
True: only some Pentax AF lenses have constant aperture values:
FA 20-35/4
F 24-50/4
FA 28-70/4
FA* 28-70/2,8
FA* 80-200/2,8
F* 250-600/5,6
FA* 250-600/5,6
That's only 7 out of
Martin Trautmann wrote:
> Constant aperture is done by adjustment 'tricks' of the
> efficient aperture
> - the diaphragm blades can be closed for shorter focal lengths.
>
> In fact I don't know why this should be done. 28-70/3.5-4.0 should be
> superior to 28-70/4.0!?
I suppose one point is, t
Unless you set the aperture from the body - then you will know the
aperture!
> -Original Message-
> From: Aaron Reynolds [mailto:[EMAIL PROTECTED]]
> Sent: 24 September 2001 13:43
> To: [EMAIL PROTECTED]
> Subject: Re: lens brightness
>
>
> Martin Trautmann wrote:
>
> > In fact I don't
Martin Trautmann wrote:
> In fact I don't know why this should be done. 28-70/3.5-4.0 should be
> superior to 28-70/4.0!?
...unless you use a hand-held meter, in which case you won't be able to
set your exposure exactly because you don't know what aperture your lens
is at.
-Aaron
-
This message
Hi,
On 2001.09.24, at 20:39, [EMAIL PROTECTED] wrote:
>> I have heard remarks that a 200/2.8 prime will transmit more
>> light than an 80-200/2.8 zoom. Is this true? I thought a
>> 200/2.8 was a 200/2.8 whether it be a prime or part of a zoom.
>
> I'm with you 2.8 is 2.8. Two different lenses,
Paul Jones wrote:
> I usually use Fuji Press 800, i have heard the new consumer Fuji 800
> is pretty good.
I can't comment on the Supras, but Fuji Superia 800 and Press 800 are
the same films, just packed and shipped differently.
-Aaron
-
This message is from the Pentax-Discuss Mail List. To u
[EMAIL PROTECTED] wrote:
> It's a beast
> of a lens, but well worth the effort, plus the price is less than half of the
> new 400/4, if you can find one.
Thanks for the info. I asked because Henry's has one for $1400 (CDN),
which still seems like a lot.
-Aaron
-
This message is from the Penta
On Mon 2001-09-24 (13:32), Ivan Prenosil wrote:
> It can't be (as people sometimes say on this list) as simple as
> lens diameter divided by focal length; otherwise my FA28-70/4
> could not be constant aperture zoom :-)
Constant aperture is done by adjustment 'tricks' of the efficient aperture
-
On Mon 2001-09-24 (07:39), [EMAIL PROTECTED] wrote:
> > I have heard remarks that a 200/2.8 prime will transmit more
> > light than an 80-200/2.8 zoom. Is this true? I thought a
> > 200/2.8 was a 200/2.8 whether it be a prime or part of a zoom.
> > Thanks for any help.
>
> I'm with you 2.8 is 2.
> I have heard remarks that a 200/2.8 prime will transmit more
> light than an 80-200/2.8 zoom. Is this true? I thought a
> 200/2.8 was a 200/2.8 whether it be a prime or part of a zoom.
> Thanks for any help.
I'm with you 2.8 is 2.8. Two different lenses, if calibrated properly,
should delive
> I have heard remarks that a 200/2.8 prime will transmit more light than an
> 80-200/2.8 zoom. Is this true? I thought a 200/2.8 was a 200/2.8 whether it
> be a prime or part of a zoom.
I believe 2.8 should be "effective" aperture, i.e. it should reflect lens construction,
light loss in glass, e
Some new toys:
Hot Shoe Grip x2
4p Sync Cord B 50cm
50mm F1.4A
Super A (real nice)
Motordrive A (real nice too)
Kind regards
Peter
-
This message is from the Pentax-Discuss Mail List. To unsubscribe,
go to http://www.pdml.net and follow the directions. Don't forget to
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In a message dated 23/09/01 04:17:03 GMT Daylight Time,
[EMAIL PROTECTED] writes:
<< In 1989 I was at Tokyo's Haneda airport and was checking in my hand
luggage.
I was carrying a martial arts kit bag which had a portable chin up bar
strapped to the outside of it. This was an extendable metal
For the same reason we don't get the silver MZ-S. Probably so they can
offer it later and catch a "second wave" of sales.
Thanks,
Ed
http://lightandsilver.com
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]] On Behalf Of Jim Apilado
> Sent: Sunday, September
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