The first budget model of the early 'Lettered' Yashica twin lens reflex cameras, with shutter speeds of 25, 50, 100, and 300. [ Leitz Hektor 12cm f/2.5 projector lens, from a late 1950's Leitz Prado 500 ]
A temporary mounting setup to test a projection lens on Sony mirrorles cameras. In this case, it's taped to a Canon EOS dumb adapter, after removing the bayonet plate, to get almost to infinity focus. [ Zeiss Vario-Sonnar 35-70mm f/3.4 @ f/5.6 ]