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04-21-2013, 08:37 AM   #1
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Ricoh Rikenon P 1:1.7 50mm Lens on a K-5

I just bought a Ricoh Rikenon P 1:1.7 50mm Lens on ebay. Will this lens fit on my K-5 or do I need an adapter? If I need one, which adapter do I need?Thanks.

04-21-2013, 08:47 AM   #2
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If its K mount it will fit. Just make sure it doesn't have a Ricoh pin. There are a couple threads on the pin and how to remove it.
Did you read its review section?
Rikoh Rikenon P 50mm F1.7 Lens Reviews - Ricoh Lenses - Pentax Lens Review Database
04-21-2013, 09:11 AM   #3
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Sorry for my ignorance, but how do I know if its a K mount? If it helps I bought it in lot auction and the lens is mounted to an old Pentax K-X 35mm camera. Would it be safe to assume it's a K mount?
04-21-2013, 09:20 AM   #4
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QuoteOriginally posted by liquid85 Quote
Sorry for my ignorance, but how do I know if its a K mount? If it helps I bought it in lot auction and the lens is mounted to an old Pentax K-X 35mm camera. Would it be safe to assume it's a K mount?
Yes, it would be.
I don't know a lot about Ricoh lenses, but be careful with that Ricoh pin (not sure if it applies to this one).

04-21-2013, 10:02 AM   #5
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All Ricoh P series lenses have the Ricoh pin. But not all are dangerous...it is probably best to remove it in this case.
04-21-2013, 10:28 AM   #6
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Which lens did you get with your camera? That one has a K mount. Now just look at its size and approximate layout.
Other brand cameras have different mounts, some only slightly different, some very different. So if you buy a lens, it has to be "for Pentax"
04-21-2013, 11:06 AM   #7
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Ricoh sold its own line of SLRs at the time and all used the K mount. I have owned several and never thought twice about the mount - in fact many old Vivitars I've owned use the KR label instead of PK to show their Ricoh compatibility! And I've used the Rikenon-P 50 f/2 and 1.7 with no issues, as well as the Sears f/1.4 that looked identical to the Rikenon XR. I've had other Rikenons with the pin, but the 50mm had more of a button which is not a problem - still, the surgery brings comfort.
04-21-2013, 11:22 AM   #8
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Yeah all "Rikenon P" lenses have the infamous Ricoh pin, I have 3 Rikenon P lenses which have all been de-pinned. I kept the pins in a safe place in case I wanted to some day reinstall the pins to use those lenses on my KR-30SP camera.

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