I have an RF5 lomo process lens 450mm f10 that is a symmetrical double gauss design. I was wondering whether I could use the rear element as an ~800mm lens if I stop it all the way down to cover 16x20inch (650mm diagonal) cibachrome that I want to shoot in camera. I am in the process of building a ULF camera and this will help me determine how I construct the camera.
Cheers Kanga
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