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Ricoh K mount lens compatibility?

Mark Stephan , Aug 15, 2012; 10:21 a.m.

I've got a couple of Ricoh Rikenon lenses, a 50 f/2 and 28 f/2.8 that I'd like to use with a Pentax manual focus body but before ordering a body from KEH I'd like to know if they are fully compatible? From what I've read online there are some differences but I'm unsure about function and compatibility.

Responses

John Shriver , Aug 15, 2012; 01:28 p.m.

The incompatability with Ricoh lenses is when they are put on an autofocus Pentax body. The "Ricoh pin" (which is their version of the contact that indicates that the aperture ring is on "A") will get stuck in the autofocus screw drive. But that should not be an issue with a manual focus body.

Walter Degroot , Aug 15, 2012; 02:37 p.m.

early Ricoh lenses do not have this pin.
and it is a simple Pentax K mount like a K1000.
For some reason the lens on my Pentax me super
and my Ricoh hr5 are virtually identical.
there is no PIN on either.
ask KEH .

Walter Degroot , Aug 15, 2012; 02:37 p.m.

early Ricoh lenses do not have this pin.
and it is a simple Pentax K mount like a K1000.
For some reason the lens on my Pentax me super
and my Ricoh hr5 are virtually identical.
there is no PIN on either.
ask KEH .

Andrew Gilchrist , Aug 15, 2012; 04:14 p.m.

For manual focus lenses/bodies there shouldn't be any serious compatibility problems but be aware that you won't get shutter-priority or full-program AE on bodies that support it like Super Program, Program Plus, P3N, etc. -- but can still use aperture-priority or manual modes.

This is where the K-mount diverged; when Pentax and Ricoh started adding features for more electronic automation (program AE, etc.) they did so in a different, incompatible manner (the 'A' position on Pentax-A and the 'P' position on similar late Ricoh lenses had similar purpose but different implementation). Then when Pentax added the autofocus screwdrive for their autofocus cameras in the late 1980's the AF coupler was located near a pin used for Ricoh's 'P' features.

Mark Stephan , Aug 15, 2012; 06:37 p.m.

Thanks for the responses, you've provided the info needed for a manual focus body. I'll stay away from the newer bodies that require A lenses for Program and Shutter priority.

Donnie Strickland , Aug 16, 2012; 06:14 p.m.

In short, if your Ricoh lenses do not have a "P" setting, you can use them with no problem, even on a newer body.

They will be usable in aperture-priority and/or manual only, as applicable.

Abbas Haider , Sep 06, 2013; 04:52 p.m.

I have same Ricoh lenses and I would like to use them on my eos body so can I simply use any k mount to eos adapter

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