lens - How exactly is "flange" defined in the term ''flange distance" - Photography Stack Exchange
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Is flange focal distance of a camera system measured from the front edge of the lens mount to the film plane, or the back edge of the lens mount to the film
terminology - What exactly is focal length when there is also flange focal distance? - Photography Stack Exchange
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Understanding Flange Focal Distance – Fotodiox, Inc. USA
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terminology - What exactly is focal length when there is also flange focal distance? - Photography Stack Exchange
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