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.
NOTE: we decided not to record Rikenon P zoom lenses, as most of them were rebranded lenses from such third-party manufacturers as Cosina, Sigma and Tokina. Some of Rikenon P prime lenses were also Cosina rebrands.
|Wide-angle prime lenses|
|2.8||Ricoh Rikenon P 28mm F/2.8 • ⌀52||1984 ●|
|2.8||Ricoh Rikenon P 28mm F/2.8 Macro • ⌀49 • Rebranded lens||1991 ●|
|2.8||Ricoh Rikenon P 28mm F/2.8 • ⌀52||1997 ●|
|2.8||Ricoh Rikenon P 35mm F/2.8 • ⌀52||1984 ●|
|Standard prime lenses|
|2.0||Ricoh Rikenon P 50mm F/2 • ⌀52||1984 ●|
|1.7||Ricoh Rikenon P 50mm F/1.7 • ⌀52||1984 ●|
|1.4||Ricoh Rikenon P 50mm F/1.4 • ⌀52||1985 ●|
|3.5||Ricoh Rikenon P 100mm F/3.5 Macro • ⌀49 • 1:2 @ CFD 0.43m • Rebranded lens||Pro||1996 ●|
|2.8||Ricoh Rikenon P 105mm F/2.8 Macro • ⌀52 • 1:1 @ CFD 0.35m • Rebranded lens||Pro||1985 ●|