I have been designing a medium format viewfinder camera. The concept will utilize the mamiya 645 leaf shutter lenses and a rb67 120 back.
Total cost (including used lens, used back and body) should be under $200 usd.
The lenses are available in 55mm,70mm,80mm and 150mm.
The back is available in 6x7 and 6x4.5.
Coverage with 70mm or 80mm lens will be an issue on 6x7, but will obviously work on 6x4.5 format. (I have not tested the 150mm yet)
Film plane register is the stock 63.3mm.
I want a lightweight, durable, easy to carry camera that can be used handheld with scale focus; or tripod mount with ground glass focus, that will also support macro work.
The body will be constructed out of plywood, cut on the router table using templates. The viewfinder will consist of 2 panes of glass with a dot in the center for alignment and frame lines etched on the front glass for framing the picture. The lens will mount via and extension tube attached to 1/8" aluminum plate facilitating interchangeability of lenses.
The body will measure 7" wide x 5.5" high x 2" deep.
Shutter release will be accomplished via a standard cable release attached to the lens shutter. It will be fed up through a hole in the body and fixed via a set-screw (large black circle with red dot). It can then be removed for tripod shooting in the field.
The shooting sequence will need to use the dark slide for the back, due to the design of the shutter in the lens. But other than that I do not see any major issues with the function.
The working mane of the concept is "mf.vf.01" (medium format.viewfinder.01)
Comments and questions?
Thanks for looking.