The 4-element Rokkor 22mm f2.8 lens is one of the best lenses in the history of 16mm still cameras. Here is a 4x5" print from a negative taken with the older 3-element Rokkor lens. Keys to sharpness are not stopping down more than f 5.6 and using the fastest shutter speed or supporting the camera on a stationary object.
Minolta16mm.jpg