10th Anniversary 2012-2022
More than just a camera lens database
1977

Ricoh K system

Discontinued

Ricoh's 35mm SLR system based on the original Pentax K mount. The most advanced cameras of the system feature an electronically controlled shutter and aperture-priority auto exposure mode, while conventional models have a mechanical shutter and offer fully manual exposure mode. In order to implement shutter priority and program auto exposure modes, Ricoh had to modify the original mount and release a separate line of cameras and Rikenon P lenses.

NOTE:

  • XR Rikenon prime lenses with focal lengths less than 28mm or more than 200mm were rebranded Sigma lenses,
  • cameras introduced for this system in the 1990s-2000s were engineered and manufactured by Cosina,
  • XR Rikenon prime lenses introduced in the 1990s were rebranded Cosina lenses,
  • we removed Rikenon zoom lenses from the database.

Camera lineup

Pentax K mount lens lineup

Fisheye lenses
2.8 Ricoh XR Rikenon 16mm F/2.8 FisheyeRebranded lens 1982 
Ultra-wide angle prime lenses
2.8 Ricoh XR Rikenon 18mm F/2.8 ⌀67Rebranded lensPro 1982 
Wide-angle prime lenses
2.8 Ricoh XR Rikenon 24mm F/2.8 ⌀52Rebranded lens 1982 
3.5 Ricoh XR Rikenon 28mm F/3.5 ⌀52
3.5 Ricoh XR Rikenon 28mm F/3.5 Aspherical ⌀52Pancake lens 1996 
2.8 Ricoh XR Rikenon 28mm F/2.8 1977 
2.8 Ricoh XR Rikenon 28mm F/2.8 ⌀52 1981 
2.8 Ricoh XR Rikenon 28mm F/2.8 ⌀52 1984 
2.8 Ricoh XR Rikenon 28mm F/2.8 ⌀52 1986 
2.8 Ricoh XR Rikenon 28mm F/2.8 ⌀52 1992 
2.8 Ricoh XR Rikenon 35mm F/2.8 ⌀52 1977 
2.8 Ricoh XR Rikenon 35mm F/2.8 ⌀52 1981 
Standard prime lenses
2.8 Ricoh XR Rikenon 45mm F/2.8 ⌀52Pancake lens 1996 
2.0 Ricoh XR Rikenon 50mm F/2 L ⌀52
2.0 Ricoh XR Rikenon 50mm F/2 S ⌀52
2.0 Ricoh XR Rikenon 50mm F/2 ⌀52 1977 
2.0 Ricoh Rikenon 50mm F/2 ⌀52 1981 
1.7 Ricoh XR Rikenon 50mm F/1.7 ⌀52 1977 
1.7 Ricoh XR Rikenon 50mm F/1.7 ⌀52 1981 
1.7 Ricoh Rikenon 50mm F/1.7 ⌀52 1981 
1.4 Ricoh XR Rikenon 50mm F/1.4 ⌀52 1977 
2.2 Ricoh XR Rikenon 55mm F/2.2 ⌀52
2.2 Ricoh Riconar 55mm F/2.2 ⌀52 1978 
1.7 Ricoh XR Rikenon 55mm F/1.7 ⌀52
1.2 Ricoh XR Rikenon 55mm F/1.2 ⌀58Rebranded lens 1996 
Medium telephoto prime lenses
2.8 Ricoh XR Rikenon 135mm F/2.8 ⌀55 1978 
4.0 Ricoh XR Rikenon 200mm F/4 ⌀52 1978 
4.0 Ricoh XR Rikenon 200mm F/4 ⌀55 1981 
Super telephoto prime lenses
4.5 Ricoh XR Rikenon 300mm F/4.5 APO ⌀67Rebranded lensPro 1982 
8 Ricoh XR Rikenon Reflex 600mm F/8 ⌀86Rebranded lens 1982 

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