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Steinheil Cassar S 50mm f/2.8 and Meyer Optik Gorlitz Primotar 50mm f/3.5 in UV

UV Lens White Balance
4 replies to this topic

#1 Reed F. Curry

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Posted 03 August 2018 - 02:36

I thought it would be interesting to see the difference between two old German lenses. Conditions were poor. It was sporadically windy with fast-moving clouds, hot and humid. However, the images below tell us a few things, imo. The exposure was one second at f5.6. In-camera WB on PTFE disc. The only PP was a one-click WB and reduction to 1000px width.

GF1, ISO 400, 1s., f5.6, SEU Gen2 for both lenses.

Steinheil Munchen Cassar S 50mm f/2.8-16 M42 mount. This is a triplet.

Posted Image


The next lens is also an old German glass. A Meyer-Optik Gorlitz Primotar E 50mm f/3.5-16 in Exakta mount. This lens is 4 elements in 3 groups.

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The Primotar has a greater DOF in f5.6 and is considerably sharper. Both lenses show some dark green in the Rudbeckia UV targets.

I should have tried a CZJ Tessar 50mm f3.5 as well. Next time.

Edited by Reed F. Curry, 03 August 2018 - 15:44.

Best regards,
Reed
http://www.uvroptics.com

#2 SteveCampbell

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Posted 03 August 2018 - 02:41

Great shots, thanks. The Cassar is a great all-around lens and one of my favorites. I believe the Tessar 2.8/50 doesn't have fantastic performance, but perhaps the 3.5/50 is better.
STEVE CAMPBELL
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#3 Andrea B.

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Posted 03 August 2018 - 02:57

Definite confirmation of both lenses' ability to capture a known UV-signature. That's the kind of "proof" we like to see. :D
Andrea G. Blum
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#4 dabateman

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Posted 03 August 2018 - 03:37

Looks like fun. I have a Steinheil 50mm f2.8. They seem to vary with softness. But after taking mine apart to fix the aperture, its sharper now. Some of the plastic barrels were little loose before. So the softness may have just been due to play within the lens.
I have also played with my Pentacon six Zeiss 50mm f4 lenses. They have a huge front element and 86mm filter thread. But I can say they are horrible for uv work. I have both the single coated and multi coated. If I remember well there was almost nothing passed in the UV spectrum for my copies.

#5 Reed F. Curry

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Posted 03 August 2018 - 14:34

Do you ever do an in-camera WB on the subject itself? I enjoy that over the PTFE WB. For example, with the Steinheil I did an in-camera WB of the scene and shot the image below. GF1, ISO 400, 1s., f5.6, SEU Gen2, Steinheil Munchen Cassar S 50mm f/2.8-16, no PP, just reduced to 1000px width.


Posted Image


A one-click WB to the original gets us this:

Posted Image


I like the variety that this in-camera WB offers.
Best regards,
Reed
http://www.uvroptics.com