PentaxForums.com - View Single Post - What's a good cheap 135mm to look out for?

*Blue* · 06-30-2009, 10:13 PM

Originally Posted by stevebrot

Rikenon-P/Sears P as well as third-party lenses labeled KR, PK/R, KA/R, etc. have a spring-loaded "pin" on the mount face that can jam into the AF drive gear of a Pentax AF body. In the worst case, the lens may have to be cut off the camera. Best case is that it causes no problems (certain designs only). These lenses can be distinguished by the presence of the pin and the "P" setting on the aperture ring.

XR Rikenon, Rikenon, and M42 screw mount Auto-Rikenon don't have this problem (all without the "P" setting on the aperture ring). Think "P" is "pin" is bad. There are illustrations on the Web (Google "Ricoh pin") that show the pin along with instructions on how to (hopefully) get remove your stuck lens.

Steve

In the event of a Ricoh pin getting stuck on an AF body, a thin feeler gauge can be slipped in between the lens and camera mount and worked until the pin can be freed up. However, the pin Ricoh pin can be removed if someone likes the lens well enough to want to use it.

06-30-2009, 10:13 PM	#19
Blue Site Supporter Location: Florida Hill Country Gallery Photos: 0 Posts: 5,684	Originally Posted by stevebrot Rikenon-P/Sears P as well as third-party lenses labeled KR, PK/R, KA/R, etc. have a spring-loaded "pin" on the mount face that can jam into the AF drive gear of a Pentax AF body. In the worst case, the lens may have to be cut off the camera. Best case is that it causes no problems (certain designs only). These lenses can be distinguished by the presence of the pin and the "P" setting on the aperture ring. XR Rikenon, Rikenon, and M42 screw mount Auto-Rikenon don't have this problem (all without the "P" setting on the aperture ring). Think "P" is "pin" is bad. There are illustrations on the Web (Google "Ricoh pin") that show the pin along with instructions on how to (hopefully) get remove your stuck lens. Steve In the event of a Ricoh pin getting stuck on an AF body, a thin feeler gauge can be slipped in between the lens and camera mount and worked until the pin can be freed up. However, the pin Ricoh pin can be removed if someone likes the lens well enough to want to use it.