A very simple device able to adapt any kind of lens interface to the standard C-Mount interface.
All the bayonet interfaces, like Canon and Nikon, can be adapted without particular action.
In some special case, this adapter can produce a vignetting phenomena, easily predictable if the lens design available.

The technical drawing shows the main dimensions and
interfaces in order to guarantee a proper assy (for
Canon FD bayonet, but others available too).
More details are available upon request.
The most important value is
the BFL (Back Focal Length)
of the C-Mount adapter that is
17.525 mm.
The BFL for Canon is 42 mm
and the BFL for Nikon is 46.5
mm (only for information).