A D-mount is a type of lens mount commonly found on 8mm movie cameras.
Throat or thread diameter 15.88 mm (0.625 inch) Mount thread pitch 32 TPI Flange focal distance 12.29 mm D-Mount lenses have found new uses in the Nikon 1 series, Fujifilm X series, Pentax Q series and other modern mirrorless cameras via adapters.
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