KMZ 20mm F3.5 MC MIR-20M Type 2 Specifications
analog/digital limited (dumb mount - aperture priority or manual modes only)
Diagonal Angle of View:
Number of Aperture Blades:
28mm rear filters
manual focus only
built-in (fixed with screws, unmountable) or without (seen both versions)
The MIR-20M originally is an M42 mount lens. It comes with a detachable mount plate whatsoever, so some of these lenses have been re-worked and sold with Canon EF mount plate instead.
The lens looks like a fisheye with its front element considerably protruding and shows the typical fisheye distortion (not corrected), although not covering such a wide angle.