Kodak 8.5 in f6.3 Commercial Ektar?

[JimboWalker]

I see Kodak info that says my Kodak 8.5in f6.3 Commercial Ektar can cover a 5x7 format. I cannot find the image circle specs to see if there is much movement beyond that format. I have only used on 4x5 and it is a wonderful lens, but I may be selling it to a guy shooting 5x7. Thanks!

[Dan Fromm]

Jimbo, the list contains a link to the best source of information on Ektar lenses in the known universe. Go there.

The best source ... quotes EKCo data sheets which give, IIRC, Commercial Ektars' recommended formats and angular coverage on those formats. They don't give image circles. When in doubt, use the f/6.3 Tessar rule of thumb. 60 degrees.

[JimboWalker]

Thanks Dan, but what list are you referring to?

[Dan Fromm]

Thanks Dan, but what list are you referring to?

There's a link to it in the first post in this discussion. It is a pdf with bookmarks that serve as an index. They don't work in on-line pdf readers, download it.

[Pfsor]

I see Kodak info that says my Kodak 8.5in f6.3 Commercial Ektar can cover a 5x7 format. I cannot find the image circle specs to see if there is much movement beyond that format.

How difficult is it to try the lens for yourself to see how much movement there is??

[Sanford]

How difficult is it to try the lens for yourself to see how much movement there is??

It could be very difficult if you don't have a 5x7 camera

[Pfsor]

It could be very difficult if you don't have a 5x7 camera

Really? What about having a piece of white paper and focus an infinity scene at it? Very difficult?

[Bernice Loui]

8-1/2" Commercial Ektar has been one of the "normal" lenses in barrel on the 5x7 Sinar for decades. Image circle is more than good enough for 5x7 with more than good enough camera movements under the majority of image making conditions.

https://www.pacificrimcamera.com/rl/00346/00346.pdf

Excellent if the specific example is in GOOD optical condition, the Kodak-Ilex or Kodak-Acme shutter might need work. In barrel using a Sinar or similar shutter, not an issue. If the lens is to be tested, it should be done using film under a wide variety of image making conditions or tested using optical specific instrumentation.



Bernice

[Bernice Loui]

Image circle observed as projected in a sheet of white paper will not behave in the same way as that same image circle projected on film. Film does not respond to light in the same way as the human eye.


Bernice

Really? What about having a piece of white paper and focus an infinity scene at it? Very difficult?

[Andrew Plume]

Check out page 63:-

http://www.cameraeccentric.com/html/info/kodak_4.html

Andrew