Nikon PB-6 with PS-6 lens mount_Mamiya 645 it's a 4x zoom with

it's a 4x zoom with a constant f1

Breakthough Photography calls this an "X2" filter

Ilford's medium-speed black and white film

Cover is damaged along the fold

Nikon PB-6 with PS-6 lens mount_Mamiya 645 it's a 4x zoom withThe NIkon PB 6 is a sturdy late model bellows with autodiaphragm operation and a built in stage focusing system. Accepts any Nikon F mount lens; the camera end is a standard F mount but practical compatibility will depend on the shape of your camera (some bulkier AF and digital cameras will require an additional extension tube not included to clear the back of the rail). In excellent condition, with PS 6 slide duplicator unit.