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Kowa 50mm f/0.75 @ infinity.
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PostPosted: Wed Sep 07, 2016 6:56 am    Post subject: Kowa 50mm f/0.75 @ infinity. Reply with quote
Mounted on an Sony A7s. I'm in the process of making a proper focussing mount for it. The image circle is unfortunately a bit small.
Sharpness is pretty good. field curvature is huge...



PostPosted: Wed Sep 07, 2016 9:21 am    Post subject: Reply with quote
Very cool! Would it cover aps-c?


PostPosted: Wed Sep 07, 2016 1:11 pm    Post subject: Reply with quote
Looks like you removed the rear element to get longer back focus,
but since that rear element also serves as a field flattener, you got
the bent field...not the way to go Wink


PostPosted: Wed Sep 07, 2016 7:26 pm    Post subject: Reply with quote
kds315* wrote:
Looks like you removed the rear element to get longer back focus,
but since that rear element also serves as a field flattener, you got
the bent field...not the way to go Wink


Just the retaining ring holding the rear element to give a bit more clearance. No glass was dismembered in the making of this photo.
I think it's the way the lens was designed.

It won't cover APS-C. It would work nicely on a 1" or 16mm sensor though.

Last edited by Opticus on Wed Sep 07, 2016 10:15 pm; edited 1 time in total


PostPosted: Wed Sep 07, 2016 7:38 pm    Post subject: Reply with quote
Maybe the rear glass element was missing already??
I have the same lens, but not that bent field...


PostPosted: Wed Sep 07, 2016 8:24 pm    Post subject: Reply with quote
Perhaps you have a different version of the lens? I remember Rodenstock had a few variants of their f/0.75 lenses. TV, XR.

This is what it looks like with the ring attached

If you look through the front element of the lens and move it around a bit, you should see the field curvature i'm talking about.



PostPosted: Wed Sep 07, 2016 11:18 pm    Post subject: Reply with quote
Might be different indeed Wink


PostPosted: Fri Sep 09, 2016 6:48 am    Post subject: Reply with quote
Kllaus, your camera has a smaller sensor? So perhaps you see only the better corrected field?
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