Essentially a re-badging of the Minolta lens of the same characteristics, this is a mirror lens. Typically mirror lenses are maligned. Lower contrast, funky bokeh. This one has a claim to fame of being AFAIK the only auto focus mirror lens ever made. And if one stack ranks other mirror lenses against this one, this one typically gets the highest marks for image quality. Using this on an A7ii with the A mount adapter that enables auto focus, la-ea4.