10th Anniversary 2012-2022
More than just a camera lens database
1984

Ricoh K (P) system

Discontinued

Ricoh's 35mm SLR system based on modified Pentax K mount with support of shutter-priority and program 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 removed Rikenon P zoom lenses from the database, as most of them were rebranded lenses from such third-party manufacturers as Cosina, Sigma and Tokina. Some of the Rikenon P prime lenses were also Cosina rebrands.

Camera lineup

Pentax K mount lens lineup

Wide-angle prime lenses
2.8 Ricoh Rikenon P 28mm F/2.8 ⌀52
2.8 Ricoh Rikenon P 28mm F/2.8 Macro ⌀49Rebranded 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 1985 
1.7 Ricoh Rikenon P 50mm F/1.7 ⌀52 1985 
1.4 Ricoh Rikenon P 50mm F/1.4 ⌀52 1985 
Macro lenses
3.5 Ricoh Rikenon P 100mm F/3.5 Macro ⌀491:2Rebranded lensPro 1996 
2.8 Ricoh Rikenon P 105mm F/2.8 Macro ⌀521:1Rebranded lensPro 1985 

Copyright © 2012-2022 Evgenii Artemov. All rights reserved. Translation and/or reproduction of website materials in any form, including the Internet, is prohibited without the express written permission of the website owner.