 There are other mirror lenses that can mount onto current mounts such as Canon EF-mount and Nikon F-mount, but all of these mirror lenses are manual focus only.Only this lens can have its focus controlled by the camera's autofocus motor in conjunction with TTL autofocus sensing.In terms of the Minolta AF and subsequent Sony α SLR systems, this lens is an anomaly, being the only lens guaranteed to auto focus at 8.