Nikon PK-2 format_Medium Format Mountable at the base with

Mountable at the base with a standard 1/4-20 threaded fitting

Grab yourself a Paterson Auto-Load Reel for Super System 4 tanks and you'll be in a good spot

This one has good locks and a shorter top plate with an open slot for the camera mounting thread

Leitz New York SL skylight filter for the 50mm f1

It has a built-in flash

Nikon PK-2 format_Medium Format Mountable at the base withThe Nikon PK 2 is a 14mm extension tube for manual focus F mount lenses. Will mount to any F lens and body, but transfers aperture information via old school pre AI bunny ears, so depending on your camera and or lens, you may need to meter stopped down on this one. In good working order, with minor cosmetic wear.