1976 Mamiya C330f has the optional Porro finder installed as well
as an auxiliary handle with shutter release trigger. This model
has the removable back. The pressure plate rotates for either 120 or
220 film. The rotation of the pressure plate also resets the film
counter and film advance mechanism. This is a very popular user
camera and my father, who bought it in 1976 at 47th. Street Photo, only
parted with this camera when he went completely digital. I still use
this camera on a regular basis. Interchangeable lenses in this
kit include an f2.8 / 80mm Sekor and a f4.5 / 180mm. Lenses are
available from 55mm to 250mm for this camera. A 'paramender' is seen in
the last photograph, this item attaches between the camera and tripod
and moves the camera up (or down) to correct for parallax when doing
close-ups.