The #128 Cooke type adapter ring adapts specific #3 shutter housing types to a COOKE camera. The adapter is attached to the camera via the six M2.5 P. H. screws and the shutter is then attached via the 2.00 inch x 40 TPI optical thread. The #128adapter is recommend for use with VS35 and CS45 series shutters. These shutters can also be equipped with the #17 âFâ Type Video Adapter.