C-Mount

C-Mount

Standardized adapter for optical lenses on CCD - cameras. C-Mount lenses have a back focal distance 17.5mm vs. 12.5mm for "CS-mount" lenses. A C-Mount lens can be used on a CS-Mount camera through the use of a 5mm extension adapter. C-mount is a 1" diameter, 32 threads per inch mounting thread (1"-32UN-2A.)