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21mm f/3.4 Super-Angulon information wanted


pgk

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Sorry,

about the problem of different engravings on SA 21 f4 or chrome SA 21 f3,4 and later black SA 21 f3,4: is it possible that first schneider calculations for DOF were due to a different circle on confusion, wider than late calculation?

 

Good thought! I would not be surprised as recent photographers become more conservative and expectations rise.

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