Mamiya 6 MF with 75mm f3.5  type_Monopods The Bronica rotary viewfinder is

The Bronica rotary viewfinder is a 90-degree viewfinder with an eyepiece that can rotate for horizontal or vertical shooting

focusing and diaphragm action are good

" at least up to the F4

not a modification

Canon Extension Tube FD 50 in good condition

Mamiya 6 MF with 75mm f3.5 &nbsptype_Monopods The Bronica rotary viewfinder isThe Mamiya 6 is a classic medium format rangefinder camera that shoots 6x6cm square images on 120 rollfilm. Full manual or aperture priority autoexposure, plus easy rangefinder manual focusing with a big, bright viewfinder. In excellent condition, with only very minor cosmetic wear from light use. Good metering, accurate rangefinder. The included Mamiya G 75mm f3. 5 L lens is in excellent condition, with only minor cosmetic wear, clean glass, smooth