Minolta's full-frame fisheye — the MD Fish-eye Rokkor 16mm f/2.8 from the late-70s MD line.
The Minolta MD Fish-eye Rokkor 16mm f/2.8 is a full-frame fisheye manual-focus lens for Minolta reflex cameras from the MD generation of the late 1970s. The Fish-eye designation marks its ultra-wide, deliberately curved projection covering a diagonal of about 180 degrees on the frame, with MD adding shutter-priority coupling to the mount.
This is a manual-focus full-frame fisheye with a 16mm focal length and a maximum aperture of f/2.8, from the MD series. Only the focal length and aperture are affirmed; other construction figures are not confirmed here and are omitted rather than guessed. Fisheyes of this type usually carry built-in colour filters behind the optics.
As a full-frame fisheye the 16mm renders an extremely wide field with characteristic curved-line distortion, filling the whole frame rather than producing a circular image. It suits creative wide interiors, dramatic landscapes and architectural effects where the bowed perspective is used intentionally, and the f/2.8 aperture aids composition and low-light framing.
On the used market this MD fisheye is an uncommon specialist Rokkor sought by collectors and creative shooters. Given its age, inspect the exposed front element for scratches and cleaning marks, check for internal haze, fungus and separation, and confirm the aperture and focus operate smoothly. Note that its bulbous front element cannot take conventional screw-in filters.