Quote Originally Posted by Steve Smith View Post
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).


Steve.
Steve, that's a nice theory. There's no guarantee that a lens will match its published specifications.

Graflex Inc. and predecessors offered several sets focusing scales for each standard issue lens e.g., the 127/4.7 Ektar. The focusing scales go on the outer bed. Lenses sold with cameras by the factory had their focal lengths' measured; the best (not always exactly correct) scale for the lens was fitted to the camera's bed. Graflex urged users who wanted to add lenses to their kit to send the additional lenses to the factory for matching to the closest focusing scales.

Parallel, to this, why do you think that Nikon and Boyer shipped their process lenses with quality control slips that gave the lens' measured focal length and measured flange-to-film distance at 1:1? Nominal isn't good enough.