Tamrac 5788 prism This Mamiya prism finder is

This Mamiya prism finder is a 45-degree pentaprism design for the Mamiya RB67 series of cameras

shutter button collar

The Kitstar X2 Converter  is a teleconverter for Canon FD mount lenses and cameras

does not accommodate the 50cm extension rail

The SLR structure means that this camera isn't exactly pocketable

Tamrac 5788 prism This Mamiya prism finder isThe Tamrac 5788 is a convertible backpack with padded upper and lower compartments (with dividers in the lower) and a laptop compartment. The straps can be configured as a normal backpack, a sling bag, or tucked out of the way. Bottom compartment dimensions are approximately 14x22x28cm; top is approximately 12x18x22cm.