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ANSI PH3.35

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ANSI PH3.35 77th Edition, 1987 METHODS/DESIGNATNG/MEASURING FOCAL LENGTHS/DISTANC

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Description / Abstract: 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