Contax S-Planar 100/4 on Contax PC bellows + ext. tubes + glassless adapter.
I need help to calculate the magnification.
Distance from the subject to the lens is 80mm.
Distance from the lens mount to camera flange is 310mm.
The lens doesn't have a helicoid so no internal/external movements.
Camera is Canon 5D Mark II. _________________ Moderator Himself
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