The main image picture is courtesy of Koji Kawakami.
Produced from 1975 to 1977, tis is the first iteration, aesthetics do match MC-X line. Fixed focus fisheye lens, apertures from /4 to /22.
Built-in Filters: 1A-FLD-Y52-R60-80B-85
It’s named to be a fantastic, ultra-sharp circular fisheye, one of the sharpest ever built.
The MD subsequent versions are very similar, with improved coating and new aesthetics other than the new functionalities of MD mount.
minolta.eazypix.de, rokkor files, Andrea Aprà for the informations