The CS45 #17 housing differs from the CS25 version given that the rear thread is a 2.00x40TPI thread. It can be adapted, using these threads, into user applications via the #125 Camelia Adapter, the #126 "F" Type Male Bayonet Adapter, the #127 Dalstar adapter, or the #128 Cooke Camera adapter.  A similar configuration can also be ordered on the VS14/25, VS35, CS25, or CS35 shutter series.