Compatibility list of M42 and manual lenses on Canon EOS 5D DSLR ... and some others with different mount, in well known 'Tower of Babel-Tradition': Tamron Adaptall II, Asahi Pentax PK, Canon FD, Canon EF, Contax Zeiss / Yashica C/Y, Leica R, Minolta MC, Nikon F, Olympus Zuiko OM, Pentacon Six, Praktina, Prakticar PB, Rollei QB, Schneider, Voigtländer DKL, Sigma Y/S, T2, Zorki M39 - tbc... last up