…or, to give it its full designation, the Minolta MD W.Rokkor-X 24mm 1:2.8.

This is an SR mount lens. The SR mount was introduced with Minolta’s first SLR, the SR-2, in 1958. (There was an SR-1, but it was released after the SR-2). All manual focus Minolta SLRs used the SR mount, but when Minolta switched to autofocus cameras the company developed a new mount. This mount, known as the Alpha mount, is still in use on Sony’s DSLRs. The MD designation identifies this as a lens specifically designed to work with the Minolta XD camera, introduced in 1977.

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