Quote Originally Posted by Dan Fromm View Post
You really should come up with a way to measure its flange-to-film distance when it is focused at a distance that makes sense (hyperfocal distance @ f/22, perhaps?).
You can find the flange distance for infinity focus here: http://www.schneideroptics.com/info/vintage_lens_data/ then work out how much to add for hyperfocal (I can't help you with that but someone will know the formula).