A quick note regarding Ricoh lenses with the troublesome "Ricoh Pin". These lenses were made for Ricoh program exposure cameras and have a prominent "P" on the aperture ring. The "pin" varies from an actual spring-loaded pin to a captive, spring-loaded ball bearing. In both cases, the "pin" will jam into the AF drive notch on the KAF mount. The ball type is a less likely to cause a problem, while the pin type is usually "fatal".
Detecting these lenses is pretty easy.
- All have the bright green "P" on the aperture ring
- Ricoh brand are labeled Rikenon-P
- 3rd-party lenses (Sears, Focal, Vivitar, etc.) usually have Ricoh, KR, or RK on the lens or mount
- The pin itself is pretty prominent and easy to spot if you are familiar with the mount
Rikenon lenses other than Rikenon-P (Rikenon, Auto-Rikenon, and XR Rikenon) are often excellent optics and perfectly safe on your camera. If, by some accident, you find yourself owning a "P" lens, all is not lost. The pin can be surgically removed.
Steve
(Resident Ricoh fan boy...)