This creature may be a Petzval. I removed the elements from the barrel and stuck them in my Polaroid Copal #1. The spacing between the two optical cells in the barrel is not so great so I figured it might form a image I could focus set into the Copal.
The rear cell screwed in the rear of the shutter OK, but the front cell.......
As you can see I used a rubber band.
The lens is approximately 80mm, no idea of speed, perhaps f2.8.
If the beast is actually a Petzval, what sorts of scene will show the swirly effect best?
I have taken some shots, which will have to be processed before I know what I have got here.
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