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MECHANICAL BACK FOCAL
DISTANCE (FLANGE BACK)
The distance from the flange of the lens
(beginning of the lens mount) to the focal plane.
C-mount lenses have a flange back distance of
17.526mm vs. 12.5mm for CS-mount.
OPTICAL BACK FOCAL
DISTANCE
The distance from the rear most portion of the
lens glass to the image plane.
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