It doesn't make mechanical sense

If two 50mm (K & FA, for the sake of argument) lenses 
have the indicator set to f "8" and f "2" is the same 
diameter, for the body to close the mechanism down to 
f "8" would not the distance be identical?

If not, why?

I've the A & FA 50s but per the discussion they would
operate identically.  So I need a K or M.  Perhaps at
the flea market tomorrow there will be a cheap option
available.

Sincerely,

Collin 




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