Leitz Hektor 12cm f/2.5 - Projector lens from a 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 ]