Rollei bayonet mount, introduced in 1970, is used on all Rollei’s 35mm SLR cameras and on most Voigtländer VSL cameras. It is also referred to as SL35. The lenses produced in that mount were mostly from Carl Zeiss and Rollei itself and were of high quality. Some lenses from reputable Schneider-Kreuznach were also produced with the QBM mount.
Rollei QBM mount lenses can be used on mirrorless and Canon EF(-S) cameras with an adapter.