The Minolta SR-mount was the bayonet mounting system used in all 35 mm SLR cameras made by Minolta with interchangeable manual focusing lenses. Several iterations of the mounting were produced over the decades, and as a result, the mount itself was sometimes referred to by the name of the corresponding lens generation (f.e. "MC", "MD" or "X-600") instead. * f/2.8 or larger maximum lens aperture, or * f/3.5 or smaller maximum aperture. The lens tab operates a switch inside the body of the X-600. There is no MD Auto Exposure feature on the X-600.