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I was looking for a list of accurate Flange to Focus distances and didn't find it anywhere (even here!). The main idea was to avoid guess work (i.e. infinity focus) and modify the adapters (or the lens) to stay as close as possible to the original Camera register. With proper distance, you get rid of CA issues etc. and maximize IQ.
Tired of searching, I downloaded a bunch of old Service Manuals. Here is a summary of the values I found with tolerance. If I missed anything or if you have some other source, please let me know.
Minolta MD: 43.73mm (+ 0.03, -0.00) from SRT Repair Manual "Body back measurement"
Nikon: 46.67mm (+/- 0.02) from N50 Service manual "Dist. between lens mount & outer film guide rail"
Canon EF: 44.14mm (+/-0.03) from EOS 1 Repair Manual "Standard to outer rail"
Olympus OM: 46.00mm (+/-0.02) from OM-1 Service Manual "Flange back standard"
Pentax: 45.46mm (+/-0.04) from Pentax-ME Serice Manual "Flange focal distance"
You will notice that these values differ quite a bit from what we usually see (Nikon at 46.5, Canon at 44 etc). This might explain some IQ issues. Also, nice to see that Minolta had the tighter tolerance of all.
OK, this is my first post here so don't jab at me too hard,
This is a great forum, couldn't have converted my Rokkor without it! (Thx Cogitech)