Ricoh's 35mm SLR system based on the modified Pentax K mount with support of shutter priority and programmed auto exposure modes. The only difference from the original mount is the addition of a small pin to signal that the aperture ring is set to the "P" position (automatic diaphragm control). However, mechanical compatibility was lost due to this additional pin: when a "P" lens is mounted on a Pentax camera, the pin enters the screw drive autofocus shaft and the lens becomes jammed on the camera.
Completeness of lens lineup
Enthusiast photography
75%
No dedicated lenses for portrait photography.
Professional photography
50%
No dedicated lenses for professional wild nature photography, architectural photography with perspective correction.