A 28mm lens was as wide as you could expect to find on an SLR. The problem was that a super-wide lens had to be so deeply recessed into the camera body that the SLR's mirror would be blocked from moving out of the light path by the back of the lens. (This was not a problem with other types of cameras, such as rangefinders because they lacked the reflex mirror.) Minolta came up with an innovative s