ANSI PH3.35
ANS PH335 1977-JAN-01 Methods of Desgnatng and Measurng Focal Lengths and Focal Dstances of Photographc Lenses
ANS PH335 1977-JAN-01 Methods of Desgnatng and Measurng Focal Lengths and Focal Dstances of Photographc Lenses
This standard covers lenses intended to be used with very distant objects. It defines the focal plane, the principal focus, the focal length, the calibrated focal length, the front focal distance, the back focal distance, the flange focal distance, and the total length and
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