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Lenses that satisfy



 
 
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  #1  
Old October 1st 10, 09:20 PM posted to rec.photo.equipment.large-format
[email protected]
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Posts: 428
Default Lenses that satisfy

On 10/1/2010 9:35 AM, Cheesehead wrote:

So the ? is:
What are the lenses you have which you find (a) satisfying and (just
to get another perspective) (b) not satisfying.


I use these on a super graphic..

Likes:

90 f8 SA

It's an old chrome one in a 00 shutter but works great in a recessed
board I found for this camera. It's the only lens I have that won't fold
up inside the camera. Never had any issues with the shutter.

135 F6.3 WF Ekatar

This lens always produces great images. Not crazy about the supermatic
shutter but it's been pretty reliable. Small size and light for the
coverage.

210 f6.8 Geronar

Great lens for the money and size with more than enough coverage for use
on my camera. Good coatings and shutter + folds up inside the camera.


Dislikes:

135mm f4.7 xenar

Maybe I just had a bad sample but this lens was disappointing. It was my
first 4X5 lens and almost gave up on 4X5 after seeing the results from this.

8.5 inch f6.3 commercial Ektar

Again, maybe it was a bad sample but I never got images that did much
for me from this lens. The lowly Geronar I replaced this with was a MUCH
better performer.

Stephe
  #4  
Old October 25th 10, 06:52 AM posted to rec.photo.equipment.large-format
Richard Knoppow
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Posts: 751
Default Lenses that satisfy


wrote in message
...
On 10/1/2010 9:35 AM, Cheesehead wrote:

So the ? is:
What are the lenses you have which you find (a)
satisfying and (just
to get another perspective) (b) not satisfying.


I use these on a super graphic..

Likes:

90 f8 SA

It's an old chrome one in a 00 shutter but works great in
a recessed board I found for this camera. It's the only
lens I have that won't fold up inside the camera. Never
had any issues with the shutter.

135 F6.3 WF Ekatar

This lens always produces great images. Not crazy about
the supermatic shutter but it's been pretty reliable.
Small size and light for the coverage.

210 f6.8 Geronar

Great lens for the money and size with more than enough
coverage for use on my camera. Good coatings and shutter +
folds up inside the camera.


Dislikes:

135mm f4.7 xenar

Maybe I just had a bad sample but this lens was
disappointing. It was my first 4X5 lens and almost gave up
on 4X5 after seeing the results from this.

8.5 inch f6.3 commercial Ektar

Again, maybe it was a bad sample but I never got images
that did much for me from this lens. The lowly Geronar I
replaced this with was a MUCH better performer.

Stephe


Xenars seem to vary all over the place. I never liked
the ones made for Graflex and I think you have one. Not
sharp at the corners until stopped down almost all the way.
Not as bad as the Wollensak Raptar/Optar but not so good.
OTOH, the f/3.5 Xenar used on the Rolleiflex and Rolleicord
is an excellent lens.
Your Commercial Ektar has some problem, these should be
exceptional lenses. However, I have found some Kodak lenses
have an odd sort of problem with the cement in the rear
component. If you look at it using grazing light it will
have an orange-peel look. That will cause a lack of
sharpness and loss of contrast. The lenses can be recemented
and, if this is the trouble with this lens, it might be
worth doing.


--

--
Richard Knoppow
Los Angeles
WB6KBL



  #5  
Old October 26th 10, 12:35 AM posted to rec.photo.equipment.large-format
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Posts: 428
Default Lenses that satisfy

On 10/25/2010 1:52 AM, Richard Knoppow wrote:

Your Commercial Ektar has some problem, these should be
exceptional lenses. However, I have found some Kodak lenses
have an odd sort of problem with the cement in the rear
component. If you look at it using grazing light it will
have an orange-peel look. That will cause a lack of
sharpness and loss of contrast. The lenses can be recemented
and, if this is the trouble with this lens, it might be
worth doing.



That likely was the problem as the contrast is what was the real issue
with it. The geronar I replaced it with was MUCH better which shouldn't
have been the case given it's a cheap, 3 element lens.

Stephey

  #6  
Old October 27th 10, 09:28 PM posted to rec.photo.equipment.large-format
Richard Knoppow
external usenet poster
 
Posts: 751
Default Lenses that satisfy


wrote in message
...
On 10/25/2010 1:52 AM, Richard Knoppow wrote:

Your Commercial Ektar has some problem, these
should be
exceptional lenses. However, I have found some Kodak
lenses
have an odd sort of problem with the cement in the rear
component. If you look at it using grazing light it will
have an orange-peel look. That will cause a lack of
sharpness and loss of contrast. The lenses can be
recemented
and, if this is the trouble with this lens, it might be
worth doing.



That likely was the problem as the contrast is what was
the real issue with it. The geronar I replaced it with was
MUCH better which shouldn't have been the case given it's
a cheap, 3 element lens.

Stephey

The Ektar may also be hazy inside. This is a common
problem with old lenses. Even a slight amount of haze will
destroy image contrast. Fortunately, the inner element
surfaces are easy to get to. I think all of the Commercial
Ektars have back caps. First, shine a flashlight through the
lens and look at it from the other side. If you see any haze
inside it is the cause of the low contrast. To clean it
remove the front element from the shutter or barrel. Then
look at the back of the cell, there should be a threaded
cap. Remove the cap and the center element will come out.
Clean both of its surfaces and the inside of the front
element with any window cleaner, I find the "streak free"
kind to be best. That should take off any haze and leave the
glass perfectly clear. Also clean both surfaces of the back
cell. Unless the cemented surface in the back is bad this
cleaning should improve the contrast noticably even on the
ground glass. Don't worry about centering, the lens mount is
designed to automatically center the elements.
To check the cemented surface remove the rear cell and
shine a flashlight obliquely at the lens and use a
magnifying glass to see the cemented surface. Do this from
both sides since it may be easier to see it from one of the
sides. The surface should be invisible. If it looks hazy or
you can see a sort of orange peel texture, the cement has
begun to separate and the lens needs to be recemented. Note
that all of the Commercial Ektar series have synthetic
cement so it does not yellow or become crystalized at the
edges. It _should_ last forever but I've seen the above
effect in a couple of lenses. I don't know what caused it
but the early synthetic cements were thermosetting and may
not have been cured exactly right. These lenses are all
getting on to be sixty or more years old and probably did
not exhibit any problems for decades. I think Commercial
Ektars are worth the cost of re-cementing. John van Stelten
at Focal Point is the fellow to contact about the work. He
can give you an estimate on the cost. Hopefully, the lens is
just dirty.
Let me know what you find.


--
--
Richard Knoppow
Los Angeles, CA, USA




  #7  
Old October 27th 10, 11:35 PM posted to rec.photo.equipment.large-format
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Posts: 428
Default Lenses that satisfy

On 10/27/2010 4:28 PM, Richard Knoppow wrote:
Let me know what you find.



I actually sold this lens years ago when I saw the results I got with
the geronar. So at this point it's only a guess what it's problem was. I
did clean the surfaces as you noted in your post so maybe was the
cement? No way to no at this point what it was.

Stephey

 




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