Re: Pentax F-series lenses - Contrarian

2004-06-27 Thread Frantisek Vlcek
Two words here are professional standards. You wouldn't want to shoot
a wedding without a 2.8 lens, in a church. With a fast lens you do not
have to use flash (or can use it just to spicy up the photographs, not
as a sole means of illumination). Of course many slower lenses are as
good optically, some even mechanically (although an exception). It's
always easier to design a slower lens to be good. But market thinking
creeps here. Pros want 2.8 glass, so most other glass is not built for
pros but for "amateurs". Thus expect lower build quality and
(sometimes) worse performance.

I shot with both 2.8 and 3.5-4.5 short zoom (20-35) and the faster
lens made a whole lot of difference. No matter where I shoot, I mostly
used the lens wide open inside. So the speed paid for itself.

That to say, I liked Pentax for providing quality alternatives, for
example for hiking - 2.8 zoom is to heavy to lug around when you hike,
and Pentax always had high quality lenses for those people. 24-35
f/3.5, FA 20-35 f/4, and similar. To the mountains, I would not take a
2.8 zoom for issues of weight. For the occassions I need fast glass
there, I would take a small fast prime.

Frantisek



Re: Pentax F-series lenses??

2004-06-26 Thread Andre Langevin
...the Tak K 135/2.5 was so inexpensive, I figured "Why not?"
keith
You saved the price of a few films but all your films will bear the 
mark of the cheaper lens.

If you take a lot of photographs, used medium aperture lenses are 
cheap, film is expensive...

Andre


Re: Pentax F-series lenses??

2004-06-26 Thread Andre Langevin
Hi Keith.  I'll expand a bit my commentary...
Bad construction and a lot of flare.  Stay away from non-SMC lenses.
I forgot who said that, but... what is meant by "bad construction?"
This started out as a Pentax lens. I assume a Pentax design. Did they goof?
I guess we'll never know, but it seems to me that an 11 element, 
constant aperture lens, with an 8 leaf shutter, is not an 
INexpensive method of putting a lens together!
I'm sure they didn't set out to make a "cheap" lens...
Most non-SMC zooms from Pentax I have taken in my hands had a 
focus/zoom ring soft enough that it wouln't stay in place unless you 
had your lens quite horizontal.  The general ring feeling was really 
not as good as on the old M80-200 or even the A70-210.  An old K or M 
zoom is a pleasure to use and won't wobble even if it becomes a bit 
soft with time. (Well... wobble may be too strong of a word some of 
the times.)

The "post-M" zooms, beginning in 1984 with the "SMC 80-200 type 2" 
zoom which was later produced without SMC, won't hold on very well 
under regular use.

A new SMC A70-210, as the one I had for a year, was doing great, but 
I have seen used ones that were not as good mechanically as the older 
K and M ones, but they are still better than non-SMC zooms (which, by 
the way, were, generally if not always, not made in Japan).


All SMC gives you is freedom from flare and such... If you use an 
otherwise capable non-SMC lens in less demanding situations, you can 
still get excellent photographs.
Yes, but contrast will probably still be lower in most situations.
If they had made this lens with SMC coatings, would the category 
immediately switch to "a great lens?"
No because optical and mechanical construction are as important.  The 
SMC-A70-210, a good lens, has non non-SMC small brother.  The non-SMC 
A70-200, a lower quality lens, has no SMC big brother.  Their quality 
is related to optical & mechanical construction more than SMC I 
think.  But a good lens deserves SMC.  Non-SMC lenses were aimed at 
low budget customers.  Unfortunately you usually get what you pay for.

Andre


Re: Pentax F-series lenses??

2004-06-26 Thread Keith Whaley

[EMAIL PROTECTED] wrote:
Keith,
I don't know about all the Takumar K-mount lenses, but I have used the Takumar K 
135/2.5.  In comparison to the M 135/3.5, I could see the difference on my 3x5 inch 
prints.  The Takumar was fuzzier in a non-flare situation.  This is why I avoid 
Takumar K-mount lenses.
Regards,  Bob S.
Really...How interesting!
I have a Tak K-mount 135/2.5 but have not used it.
I will look for the differences.
It's so easy to use my authentic Tak M42 135s (f/2.5 and f/3.5) on my K 
bodies, with the adapter, and I DO know how they record images!
Still, the Tak K 135/2.5 was so inexpensive, I figured "Why not?"

keith
Keith writes:

All SMC gives you is freedom from flare and such... If you use an
otherwise capable non-SMC lens in less demanding situations, you can
still get excellent photographs. If they had made this lens with SMC
coatings, would the category immediately switch to "a great lens?"
Curious so many denigrate it...
keith whaley



Re: Pentax F-series lenses??

2004-06-26 Thread Rfsindg
Keith,
I don't know about all the Takumar K-mount lenses, but I have used the Takumar K 
135/2.5.  In comparison to the M 135/3.5, I could see the difference on my 3x5 inch 
prints.  The Takumar was fuzzier in a non-flare situation.  This is why I avoid 
Takumar K-mount lenses.
Regards,  Bob S.

Keith writes:

> All SMC gives you is freedom from flare and such... If you use an
> otherwise capable non-SMC lens in less demanding situations, you can
> still get excellent photographs. If they had made this lens with SMC
> coatings, would the category immediately switch to "a great lens?"
> 
> Curious so many denigrate it...
> 
> keith whaley



Re: Pentax F-series lenses??

2004-06-26 Thread Keith Whaley

Peter J. Alling wrote:
You seemed to me that you were, I just wished to correct what appeared 
to me to be a misapprehension.  No other criticism implied.
Okay. I did learn something from the conversation, however. I had 
confirmation that it was merely rebadged.
Don't ask me why, but I need to know these things.  

keith
Keith Whaley wrote:

Peter J. Alling wrote:
Pentax didn't stop making it, they just started selling it under 
their Takumar brand.  

I gathered as much. Sorry for the implication that it was otherwise. 
I'll be more careful around you in the future.

Prior to K mount all Asahi lenses were Takumars.
Yes, I'm aware of that. Did I imply otherwise?
keith whaley



Re: Pentax F-series lenses - Contrarian

2004-06-26 Thread Pentxuser
I have been following this thread with some interest waiting for the time to 
put my 2 cents in. I learned that my FA lenses are no good. It's been 
suggested that unless a lens is an f2.8, it does not measure up to professional 
standards.
Puuuease!
This is an elitist attitude based on having more money than common sense and 
thinking that the more you pay for something the better it has to be. When it 
comes to expensive photography lenses it is not ALWAYS the case. 
Now I like to consider myself a contrarian by nature. So, of course, few 
people will agree with me. That's ok, I don't expect them to.
Let me start by saying something crazy like 80 per cent of the 
non-professional photographers sporting 80-200, 300 and 20-35 F2.8s don't neeed them. 
90 per 
cent of the time they could get the exact same shots with "consumer grade" 
zooms. That's not to say that I don't want all these lenses in my arsenal. But 
it's not because the image quality is so much more superior to the more 
consumer grade lenses.   
Without getting too far into a debate about the value of fast lenses, IMHO 
the real value of these lenses is in their build quality and the bright image 
they give through the viefinder. This often translates into a lens that is a joy 
to use and that is, in many cases, reason enough to want one. The cost of 
that one extra stop is invaluable to photo journalists for example and other 
professionals who have to come home with a shot. But for the rest of us, it's a 
luxury that we could easily live without. 
In saying all this, where can I get a nice 800-200 f2.8?
Vic 



Re: Pentax F-series lenses??

2004-06-26 Thread Keith Whaley

Alan Chan wrote:
It's very cheap. How can you go wrong? 
Was it "very cheap" when it was sold under the Pentax-A label?
Just wondering, as I usually think of a Pentax labeled lens as having 
some minimum level of quality...
And, for that matter, a Takumar lens was once an indicator of a superior 
lens, on the general lens market, so that's not meant to demean Takumar 
lenses...

Alan Chan
http://www.pbase.com/wlachan

Okay, that's one opinion...
Any others?

Bad construction and a lot of flare.  Stay away from non-SMC lenses.
I forgot who said that, but... what is meant by "bad construction?"
This started out as a Pentax lens. I assume a Pentax design. Did they goof?
I guess we'll never know, but it seems to me that an 11 element, 
constant aperture lens, with an 8 leaf shutter, is not an INexpensive 
method of putting a lens together!
I'm sure they didn't set out to make a "cheap" lens...

All SMC gives you is freedom from flare and such... If you use an 
otherwise capable non-SMC lens in less demanding situations, you can 
still get excellent photographs. If they had made this lens with SMC 
coatings, would the category immediately switch to "a great lens?"

Curious so many denigrate it...
keith whaley


Re: Pentax F-series lenses??

2004-06-26 Thread Keith Whaley

Alan Chan wrote:
It's very cheap. How can you go wrong? 
Since it was given to me, I can't!  
keith
Alan Chan
http://www.pbase.com/wlachan
Okay, that's one opinion...
Any others?
Bad construction and a lot of flare.  Stay away from non-SMC lenses.



Re: Pentax F-series lenses??

2004-06-26 Thread Keith Whaley

Peter J. Alling wrote:
Pentax didn't stop making it, they just started selling it under their 
Takumar brand.  
I gathered as much. Sorry for the implication that it was otherwise. 
I'll be more careful around you in the future.

Prior to K mount all Asahi lenses were Takumars.
Yes, I'm aware of that. Did I imply otherwise?
keith whaley


Re: Pentax F-series lenses??

2004-06-25 Thread Alan Chan
It's very cheap. How can you go wrong? 
Alan Chan
http://www.pbase.com/wlachan
Okay, that's one opinion...
Any others?
Bad construction and a lot of flare.  Stay away from non-SMC lenses.
_
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Re: Pentax F-series lenses??

2004-06-25 Thread Peter J. Alling
Pentax didn't stop making it, they just started selling it under their 
Takumar brand.  Prior to K mount all Asahi lenses were Takumars.

Keith Whaley wrote:

Gonz wrote:

Keith Whaley wrote:

Fred wrote:
I concur.  The "SMC PENTAX-A 70-210/4" has been a very sharp and good
performer overall for me.  I've not purchased the 80-200 2.8 because
this lens is so good that its hard to justify the expense and size 
for
just one more stop and probably marginal sharpness improvement.


I'm quite happy with the A 70-210/4, and I've never been able to
justify a jen-you-wine Pentax 80-200/2.8 (although, if price were no
object, then justification would come quite easily - ).


Have you any idea how the Pentax-A 70-200mm f/4.0 compares?
Only a silly 10mm shorter!  Who'd know?  


I didn't know there was a "A 70-200/4".  There is only the FA 
70-200/4-5.6 in Boz's site.

No, not quite. See below.
A little over a year ago I got an Asahi [Ka mount] Takumar-A 70-200mm 
f/4.0 zoom Macro lens (catalog #2731)  with one of my Pentax camera 
body purchases.
In looking it up, I determined it was made from 1989-1993, and has the 
same specs as the Pentax-A that preceded it -- which had been 
manufactured in 1987: 11 elements in 9 groups, 8-blade aperture, 52mm 
filter ring.
I was impressed with the fact that after Pentax stopped making (or 
marketing?) it's version, apparently the design was picked up, 
rebadged as a Takumar lens and sold for 4 more years.

BTW - I just left Boz' site, and under non-SMC zoom lenses, there are 
indeed entries for both the Pentax-A 70-200mm f/4.0 and the Takumar-A 
70-200mm f/4.0 Macro lenses.
Comparing specs, you can see they are identical...

keith whaley
keith whaley
However, I've been quite pleased with the ol' manual focus Tokina
AT-X 80-200/2.8, and have used it quite a bit when the extra speed
justified lugging it around instead of the 70-210/4 (and the extra
speed also justified the "pinching" of the zoom range - although
most of us usually tend to think of a 80-200 zoom as being about the
same as an 70-210 zoom for range, a 2.5-to-1 zoom range is ~not~ the
same as a 3-to-1 zoom range).  No, it's not SMC, but it is (in
telescope terms) a pretty good "light bucket".
Recently I've also gotten hold of a Tokina AT-X "PRO" ()
80-200/2.8 autofocus lens (which is optically ~not~ the same as the
manual focus version), but I haven't had a chance to use it much
yet.  Does anyone have any comments to offer on this critter, either
in comparison to the manual focus AT-X, or to Pentax glass?
Fred









Re: Pentax F-series lenses??

2004-06-25 Thread Herb Chong
this sounds like the collimation effect that lens manufactures talk about.
light from conventional lenses not designed for digital hit the film/sensor
plane at too acute an angle and can cause this.

Herb
- Original Message - 
From: "Frantisek Vlcek" <[EMAIL PROTECTED]>
To: "Fred" <[EMAIL PROTECTED]>
Sent: Friday, June 25, 2004 6:36 PM
Subject: Re: Pentax F-series lenses??


> I did try it on a DSLR, and found a peculiar thing, which exhibited
> itself again with ATX 20-35 f/2.8 - in contrasty areas with blown-out
> small highlights, the highlights had sharp blue edges all around,
> which was quite nasty. Most pronounced it was in the 235 lens. I am
> not sure now if I can find the pictures (it was just a quick test),
> but other lenses of similar speed and focal length did not do this.




Re: Pentax F-series lenses??

2004-06-25 Thread Fred
> I didn't know there was a "A 70-200/4". There is only the FA
> 70-200/4-5.6 in Boz's site.

Look for it under the non-SMC lenses page.

Fred




Re: Pentax F-series lenses??

2004-06-25 Thread Gonz

Keith Whaley wrote:

Fred wrote:
I concur.  The "SMC PENTAX-A 70-210/4" has been a very sharp and good
performer overall for me.  I've not purchased the 80-200 2.8 because
this lens is so good that its hard to justify the expense and size for
just one more stop and probably marginal sharpness improvement.

I'm quite happy with the A 70-210/4, and I've never been able to
justify a jen-you-wine Pentax 80-200/2.8 (although, if price were no
object, then justification would come quite easily - ).

Have you any idea how the Pentax-A 70-200mm f/4.0 compares?
Only a silly 10mm shorter!  Who'd know?  
I didn't know there was a "A 70-200/4".  There is only the FA 
70-200/4-5.6 in Boz's site.

keith whaley
However, I've been quite pleased with the ol' manual focus Tokina
AT-X 80-200/2.8, and have used it quite a bit when the extra speed
justified lugging it around instead of the 70-210/4 (and the extra
speed also justified the "pinching" of the zoom range - although
most of us usually tend to think of a 80-200 zoom as being about the
same as an 70-210 zoom for range, a 2.5-to-1 zoom range is ~not~ the
same as a 3-to-1 zoom range).  No, it's not SMC, but it is (in
telescope terms) a pretty good "light bucket".
Recently I've also gotten hold of a Tokina AT-X "PRO" ()
80-200/2.8 autofocus lens (which is optically ~not~ the same as the
manual focus version), but I haven't had a chance to use it much
yet.  Does anyone have any comments to offer on this critter, either
in comparison to the manual focus AT-X, or to Pentax glass?
Fred






Re: Pentax F-series lenses??

2004-06-25 Thread Keith Whaley
Okay, that's one opinion...
Any others?
keith
Andre Langevin wrote:
Have you any idea how the Pentax-A 70-200mm f/4.0 compares?
Only a silly 10mm shorter!  Who'd know?  
keith whaley

Bad construction and a lot of flare.  Stay away from non-SMC lenses.
Andre




Re: Pentax F-series lenses??

2004-06-25 Thread Andre Langevin
Have you any idea how the Pentax-A 70-200mm f/4.0 compares?
Only a silly 10mm shorter!  Who'd know?  
keith whaley
Bad construction and a lot of flare.  Stay away from non-SMC lenses.
Andre


Re: Pentax F-series lenses??

2004-06-25 Thread Keith Whaley

Fred wrote:
I concur.  The "SMC PENTAX-A 70-210/4" has been a very sharp and good
performer overall for me.  I've not purchased the 80-200 2.8 because
this lens is so good that its hard to justify the expense and size for
just one more stop and probably marginal sharpness improvement.

I'm quite happy with the A 70-210/4, and I've never been able to
justify a jen-you-wine Pentax 80-200/2.8 (although, if price were no
object, then justification would come quite easily - ).
Have you any idea how the Pentax-A 70-200mm f/4.0 compares?
Only a silly 10mm shorter!  Who'd know?  
keith whaley
However, I've been quite pleased with the ol' manual focus Tokina
AT-X 80-200/2.8, and have used it quite a bit when the extra speed
justified lugging it around instead of the 70-210/4 (and the extra
speed also justified the "pinching" of the zoom range - although
most of us usually tend to think of a 80-200 zoom as being about the
same as an 70-210 zoom for range, a 2.5-to-1 zoom range is ~not~ the
same as a 3-to-1 zoom range).  No, it's not SMC, but it is (in
telescope terms) a pretty good "light bucket".
Recently I've also gotten hold of a Tokina AT-X "PRO" ()
80-200/2.8 autofocus lens (which is optically ~not~ the same as the
manual focus version), but I haven't had a chance to use it much
yet.  Does anyone have any comments to offer on this critter, either
in comparison to the manual focus AT-X, or to Pentax glass?
Fred





Re: Pentax F-series lenses??

2004-06-25 Thread Fred
> I concur.  The "SMC PENTAX-A 70-210/4" has been a very sharp and good
> performer overall for me.  I've not purchased the 80-200 2.8 because
> this lens is so good that its hard to justify the expense and size for
> just one more stop and probably marginal sharpness improvement.

I'm quite happy with the A 70-210/4, and I've never been able to
justify a jen-you-wine Pentax 80-200/2.8 (although, if price were no
object, then justification would come quite easily - ).

However, I've been quite pleased with the ol' manual focus Tokina
AT-X 80-200/2.8, and have used it quite a bit when the extra speed
justified lugging it around instead of the 70-210/4 (and the extra
speed also justified the "pinching" of the zoom range - although
most of us usually tend to think of a 80-200 zoom as being about the
same as an 70-210 zoom for range, a 2.5-to-1 zoom range is ~not~ the
same as a 3-to-1 zoom range).  No, it's not SMC, but it is (in
telescope terms) a pretty good "light bucket".

Recently I've also gotten hold of a Tokina AT-X "PRO" ()
80-200/2.8 autofocus lens (which is optically ~not~ the same as the
manual focus version), but I haven't had a chance to use it much
yet.  Does anyone have any comments to offer on this critter, either
in comparison to the manual focus AT-X, or to Pentax glass?

Fred




Re: Pentax F-series lenses??

2004-06-25 Thread Fred
> For me, the F series is the K series of the Pentax auto focus
> lenses.

...and if you're a lover of nice manual focus lenses, that's kinda
sad...  

That's probably a pretty good analogy, though.

Fred




Re: Pentax F-series lenses??

2004-06-25 Thread Gonz
I concur.  The "SMC PENTAX-A 70-210/4" has been a very sharp and good 
performer overall for me.  I've not purchased the 80-200 2.8 because 
this lens is so good that its hard to justify the expense and size for 
just one more stop and probably marginal sharpness improvement.

rg
Alan Chan wrote:
I had the "SMC PENTAX-A 70-210/4" which I think is a great "zoom" 
lens. I did some outdoor test near infinity against the 3rd generation 
AF Nikkor 80-200/2.8 few years ago. To my surprised, their sharpness 
were so close I thought I did something wrong (Nikkor was sharper, but 
not by much). I even used one of those Pentax vibrators like "Super A" 
for trhe test, and Nikon F90X. I also owned the Nikkor AF 
70-210/4-5.6D and did some tests against the Pentax too between 2-3 
metres with flash. The Nikkor was way softer and inferior than the 
Pentax at all focal lengths and apertures (though the Nikkor had more 
pleasing colour). It was like the Nikkor required 3 stops difference 
to achieve the same level of sharpness as the Pentax did. Since there 
are non-SMC variants which are similar to the "SMC PENTAX-A 70-210/4", 
I suspect photdo mixed them up and thought it was "SMC PENTAX-A 
70-210/4". Afterall, there is no "SMC PENTAX-A 70-200/4" as they 
suggested. If the dog lens like Nikkor AF 70-210/4-5.6D could achieve 
2.8, no way the Pentax got 2.2 only. They must make some mistake along 
the way. Simply as that.

Alan Chan
http://www.pbase.com/wlachan
I have never owned a A70-210/4 but I notice everyone seems to have agood
opinion of it even though  www.photodo.com gives it only a grade 
2.2.  By
comparison the F 70-210/4-5.6 is given a rating of 3.4.  Could it be 
that
the A70-210/4 was good for its time but has been eclipsed by better
technology?

_
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Re: Pentax F-series lenses??

2004-06-25 Thread Fred
> While an "overall impression" can be delivered in a single number,
> you'd need commentary to determine how that overall impression was
> reached.

...and every user would want to determine his/her own method of
"averaging" or "combining" ratings to come up with that number...

Fred




RE: Pentax F-series lenses??

2004-06-25 Thread Jens Bladt
There will always be discussions about lens tests.
However, measuring resolution in lp/mm is a good starting point - after all,
we all want to know to which degree detail can be recorded on film. If you
don't trust tests, I guess it's a good idea to test it your self. Or have
someone photograph a test target or a newspaper page a various
apertures/focal lengths at a given distance in daylight - then judge for
your self. You are the final judge. If you think it's good enough, then it
is.

I know photodo gave - for instance the FA 70-200mm - bad grades. I have
owned this lens - and it really WAS bad. The F 4-5.6/70-210 was rated quite
high in German Fotomagazin as well as by photodo. And it really is quite
good, although a little slow for some of my needs (concert shots etc.).

I wish there was some kind of standard independent testing organisation, who
could test all new (and some old) lenses.
In the old days, Fotomagazine did a good job. After the death of the guy who
invented the test, I don't know. I guess the problem is that photographic
magazines are NOT independent, because their main source of income is the
photographic manufacturers. We should actually form some kind of user
organisation to provide the necessary tests.

Jens Bladt
mailto:[EMAIL PROTECTED]
http://hjem.get2net.dk/bladt


-Oprindelig meddelelse-
Fra: Frantisek Vlcek [mailto:[EMAIL PROTECTED]
Sendt: 25. juni 2004 08:44
Til: Nenad Djurdjevic
Emne: Re: Pentax F-series lenses??


ND> I have never owned a A70-210/4 but I notice everyone seems to have agood
ND> opinion of it even though  www.photodo.com gives it only a grade 2.2.
By
ND> comparison the F 70-210/4-5.6 is given a rating of 3.4.  Could it be
that

Just do not believe all lens tests. Simple. Judge for yourself. There were
big discussions about photodo some years back here IIRC, but it's lost from
the archives probably.

Best regards,
   Frantisek Vlcek





Re: Pentax F-series lenses??

2004-06-24 Thread Arnold Stark
Hello
whereever possible, I replaced my FA lenses with F lenses because of the 
better build quality, the better materials, the better feel, and also 
the better mechanics. It is true that the focusing ring of F lenses is 
narrow. However, once you get used to the narrowness, the actual 
focussing feel is at least as good as with the FA lenses. For me, the F 
series is the K series of the Pentax auto focus lenses. Yes, there are 
holes in the F series primes line-up. However, that does not reduce the 
value of the F primes that exist. I own  the F28/f2.8, F50/f1.4, 
F50/f1.7, F50/f2.8, F100/f2.8, F135/f2.8, F*300/f4.5, and I am happy 
with all of them. The only one that was updatet optically by an FA lens 
was the 28.

Also, I do not agree with the statement "Personally, my gripe with F 
lenses is that they are for the most part cheesy zooms--a lot of the 
good stuff either died off in the K or A era or was only updated as FA 
rather than F."

Which "cheesy" zooms do you mean?
The F24-50 is optically identical to the A24-50
The F28-80 is optically identical to the A28-80 and way better than the 
FA28-80s.
OK, the A28-135/f4 was not replaced by an F lens, however, the FA28-200 
was not a replacemet, either.
The F35-70 is optically identical to the A35-70/f3.5-4.5
The F35-105/f4-5.6 was slower than the great A35-105/f3.5, however, it 
is not a bad zoom at all
The F35-135 is optically identical to the A35-135
The F70-210/f4-5.6 was slower than the great A70-210/f4, however, it is 
of the same quality.
The F*250-600/f5.6 was an improvement over the K135-600/f6.7.

Speeking of "cheesy zooms", the ones that come to my mind are the 
FA28-80/f3.5-4.5, FA70-200/F4-5.6, and the FA28-200.

Arnold
[EMAIL PROTECTED] schrieb:
I haven't run anything like a proper test, but so far I'd agree with you  on the F* 
300/4.5.  I suspect it will test better than the other slow 300s I have to put against 
it.  IMHO no 300/4.5 is going to work well on a 2x converter (too dark), and from what 
I've heard most 2x converters cause a loss of quality that most professionals find 
intolerable.
F lenses are hard to find used, and presumably impossible to find new. They aren't exactly attractive, and they don't have the build quality of even the A lenses.  Manual focus with them is not great (in common with  early AF lenses from other manufacturers).  Most of the good ones appear to be optically identical to the A versions.  All of these seem to be 
valid reasons why the F lenses are unpopular.

Personally, my gripe with F lenses is that they are for the most part cheesy zooms--a lot of the good stuff either died off in the K or A era or was only updated as FA rather than F.  Given the lens focal lengths and  apertures that I would like to carry, there are almost no F versions  (no wides wider than 28, no 28/2.0, no 35,  only a soft-focus 85, no 200, 
only the 600/4 for big glass).  There are A versions, and often FA versions.

Really the only NEW F primes I can think of are the 300/4.5 and the 135/2.8, both of which are well regarded, and the 600/4 which we  understandably don't hear much about. 

DJE

 




Re: Pentax F-series lenses??

2004-06-24 Thread Frantisek Vlcek
ND> I have never owned a A70-210/4 but I notice everyone seems to have agood
ND> opinion of it even though  www.photodo.com gives it only a grade 2.2.  By
ND> comparison the F 70-210/4-5.6 is given a rating of 3.4.  Could it be that

Just do not believe all lens tests. Simple. Judge for yourself. There were
big discussions about photodo some years back here IIRC, but it's lost from
the archives probably.

Best regards,
   Frantisek Vlcek



Re: Pentax F-series lenses??

2004-06-24 Thread Alan Chan
F lenses are hard to find used, and presumably impossible to find new.
They aren't exactly attractive, and they don't have the build quality
of even the A lenses.  Manual focus with them is not great (in common with
early AF lenses from other manufacturers).  Most of the good ones appear
to be optically identical to the A versions.  All of these seem to be
valid reasons why the F lenses are unpopular.
I believe their regular F primes were built well, certainly better than FA 
lenses. They may have plastic shells, but metal inside.

Really the only NEW F primes I can think of are the 300/4.5 and the
135/2.8, both of which are well regarded, and the 600/4 which we
understandably don't hear much about.
You missed the macros, and the F*250-600/5.6 too.
Alan Chan
http://www.pbase.com/wlachan
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Re: Pentax F-series lenses??

2004-06-23 Thread Alan Chan
The F* 300mm f/4.5 is pretty highly regarded, by me at least.  Its so sharp 
you could cut yourself just looking at the slides.
Unfortunately, it doesn't do well with A2X-S.  :-(
A lot of people choose this lens over the FA* version as it has a tripod 
mount.  Optically the two lenses are identical.  I just wish that the F* 
lens had the focussing clutch mechanism of the FA.
A lot of people choose this lens over the FA* version as it has a tripod 
mount.  Optically the two lenses are identical.  I just wish that the F* 
lens had the focussing clutch mechanism of the FA.
I did too, but ironically, after some tests I did for myself, I use the 
tripod mount no longer. However, the built-in hood is still much preferred.

Alan Chan
http://www.pbase.com/wlachan
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Re: Pentax F-series lenses??

2004-06-23 Thread David Mann
On Jun 24, 2004, at 5:13 AM, That Guy wrote:
I don't see much mention of these lenses on this list.
(snip)
The F* 300mm f/4.5 is pretty highly regarded, by me at least.  Its so 
sharp you could cut yourself just looking at the slides.

A lot of people choose this lens over the FA* version as it has a 
tripod mount.  Optically the two lenses are identical.  I just wish 
that the F* lens had the focussing clutch mechanism of the FA.

Cheers,
- Dave
http://www.digistar.com/~dmann/


Re: Pentax F-series lenses??

2004-06-23 Thread Antonio Aparicio
I think I saw one on ebay earlier today ...
A.
On 23 Jun 2004, at 22:33, Alan Chan wrote:
I guess it's because most "good" F lenses are rare and hard to find  
now. I have been looking for a mint F50/1.4 for years but seen none so  
far.

Alan Chan
http://www.pbase.com/wlachan
I don't see much mention of these lenses on this list.  I see lots of  
A, M,
and FA talk of course.  I've recently gotten 2 F series lenses, the  
28 2.8
and the 50 1.7.  The 28 2.8 gives nice results, with good sharpness  
even
wide open, the 50 1.7 is extraordinary.  I feel that it out resolves  
the A
series 50 1.7 in all respects, regarding color contrast, sharpness,  
control
of aberrations and ultimate resolution.  And the A 50 1.7 is really,  
really
good!  Even using the F 50 1.7 on my istD there is very little  
vignetting
wide open...  Better than the A series.  A very impressive lens, and
available for very good prices on ebay.  The AF is also good by Pentax
standards.
_
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RE: Pentax F-series lenses??

2004-06-23 Thread Alan Chan
I guess it's because most "good" F lenses are rare and hard to find now. I 
have been looking for a mint F50/1.4 for years but seen none so far.

Alan Chan
http://www.pbase.com/wlachan
I don't see much mention of these lenses on this list.  I see lots of A, M,
and FA talk of course.  I've recently gotten 2 F series lenses, the 28 2.8
and the 50 1.7.  The 28 2.8 gives nice results, with good sharpness even
wide open, the 50 1.7 is extraordinary.  I feel that it out resolves the A
series 50 1.7 in all respects, regarding color contrast, sharpness, control
of aberrations and ultimate resolution.  And the A 50 1.7 is really, really
good!  Even using the F 50 1.7 on my istD there is very little vignetting
wide open...  Better than the A series.  A very impressive lens, and
available for very good prices on ebay.  The AF is also good by Pentax
standards.
_
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Re: Pentax F-series lenses??

2004-06-23 Thread Antonio Aparicio
Nah, looks are important. Performance is for nerds.
A.
On 23 Jun 2004, at 21:39, Kenneth Waller wrote:
"Yes but ... F series lenses look silly"
Yeah but their performance is what is important!
Subject: Re: Pentax F-series lenses??
Yes but ... F series lenses look silly. Were they designed for the army
or somethin?



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Re: Pentax F-series lenses??

2004-06-23 Thread Kenneth Waller

"Yes but ... F series lenses look silly"

Yeah but their performance is what is important!

Subject: Re: Pentax F-series lenses??

Yes but ... F series lenses look silly. Were they designed for the army 
or somethin?






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A better way to Internet
http://www.peoplepc.com



Re: Pentax F-series lenses??

2004-06-23 Thread John Whittingham
Buid quality seems pretty good on the F 50mm 1.7 though, I've just bought one 
and it feels as if it's got.metal!!!...inside it 
somewhere, even the focusing is smooth and precise if a little light.

John Whittingham

Technician

-- Original Message ---
From: Antonio Aparicio <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
Sent: Wed, 23 Jun 2004 20:48:23 +0200
Subject: Re: Pentax F-series lenses??

> Yes but ... F series lenses look silly. Were they designed for the 
> army or somethin?
> 
> Antonio
> 
> . Designed by someone who was heavily influenced by
> 
> On 23 Jun 2004, at 19:13, That Guy wrote:
> 
> >
> >
> > I don't see much mention of these lenses on this list.  I see lots of 
> > A, M,
> > and FA talk of course.  I've recently gotten 2 F series lenses, the 28 
> > 2.8
> > and the 50 1.7.  The 28 2.8 gives nice results, with good sharpness 
> > even
> > wide open, the 50 1.7 is extraordinary.  I feel that it out resolves 
> > the A
> > series 50 1.7 in all respects, regarding color contrast, sharpness, 
> > control
> > of aberrations and ultimate resolution.  And the A 50 1.7 is really, 
> > really
> > good!  Even using the F 50 1.7 on my istD there is very little 
> > vignetting
> > wide open...  Better than the A series.  A very impressive lens, and
> > available for very good prices on ebay.  The AF is also good by Pentax
> > standards.
> >
> > -That Guy
> >
--- End of Original Message ---



Re: Pentax F-series lenses??

2004-06-23 Thread Antonio Aparicio
Yes but ... F series lenses look silly. Were they designed for the army 
or somethin?

Antonio
. Designed by someone who was heavily influenced by
On 23 Jun 2004, at 19:13, That Guy wrote:

I don't see much mention of these lenses on this list.  I see lots of 
A, M,
and FA talk of course.  I've recently gotten 2 F series lenses, the 28 
2.8
and the 50 1.7.  The 28 2.8 gives nice results, with good sharpness 
even
wide open, the 50 1.7 is extraordinary.  I feel that it out resolves 
the A
series 50 1.7 in all respects, regarding color contrast, sharpness, 
control
of aberrations and ultimate resolution.  And the A 50 1.7 is really, 
really
good!  Even using the F 50 1.7 on my istD there is very little 
vignetting
wide open...  Better than the A series.  A very impressive lens, and
available for very good prices on ebay.  The AF is also good by Pentax
standards.

-That Guy