Minolta's late MD ultra-wide — the 20mm f/2.8, a fast final-generation wide prime from the early 80s.
The Minolta MD 20mm f/2.8 is an ultra-wide manual-focus lens for Minolta reflex cameras from the final MD generation of the early 1980s, when Minolta dropped the Rokkor name from most lens barrels. It was a fast ultra-wide in the mature MD system, aimed at photographers needing a very broad rectilinear field with a usefully bright aperture.
This is a manual-focus ultra-wide lens with a 20mm focal length and a maximum aperture of f/2.8, from the last MD line. Only the focal length and aperture are affirmed; other construction figures are not confirmed here and are omitted rather than guessed. It succeeded the earlier MD W Rokkor 20mm f/2.8 in the range.
At 20mm the lens delivers a sweeping angle of view for landscapes, architecture and expansive interiors, while the fast f/2.8 aperture aids composition and handheld work in dimmer light, unusual for an ultra-wide. It keeps straight lines straight, making it well suited to buildings and interiors where a fisheye would be inappropriate.
On the used market this fast final-generation MD ultra-wide is desirable, sought by collectors and wide-angle enthusiasts adapting vintage glass. Because of its age, check for haze, fungus and separation, confirm the aperture blades are clean and snappy, and verify the focus ring turns smoothly. Inspect the coatings for wear, and use an adapter for mirrorless mounting.