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08-21-2009, 01:22 AM   #1
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Rikenon XR 28mm and 135mm

I have 2 Ricoh Rikenon k-mount lenses that came with a Ricoh camera I bought new in the late 70's (maybe early 80's)

One is a XR Rikenon 28mm 1:2.8 and the other is a XR Rikenon 135mm 1:2.8

I have heard that these XR lenses don't have any of the Ricoh "pin" problems of other Ricoh lenses.

Has anyone used either of these with a Pentax DSLR? I have just remembered I had them and attached them to my K200D. A quick glance at the few shots I've taken suggest these lenses might be quite good.

I'd be interested to hear from anyone who has experience with these lenses.

08-21-2009, 01:55 AM   #2
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I'm the proud owner of the 135mm f2.8 Rikenoh. No issues with my K20D but I can't say if that pin was modified as I bought it second hand. A lovely lens BTW.
08-21-2009, 07:32 AM   #3
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Yep, the XR series Rikenons have a straight K-mount and no Ricoh pin. It is the Rikenon P series that causes the problems. Those are clearly labeled as such and have a bright green "P" position on the aperture ring.

Enjoy your lenses and post some of your results. The XR lenses have a good reputation and there is some evidence that a few models may actually have been designed/made by Pentax. (I don't remember the details here, though I am confident that another forum member will chime in!) The 28/2.8 is reviewed on this site, but nobody has done a review yet on the 135/2.8.

Steve
08-21-2009, 07:43 AM   #4
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If these are the first series of Ricoh K lenses, they were manufactured by Pentax and - perhaps apart from coatings - identical formulas to the Pentax K lenses. Source: Modern Photo magazine review of the first Richoh K camera.

08-21-2009, 11:52 AM   #5
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I have four Ricoh "P" lenses (28mm, 50mm 1.7, 50mm 2, and 105 Macro) with the pin intact and none of them have given me any problems with my K10D and now K20D. I think the problem is only with some of the third-party lenses made for this series.
08-21-2009, 01:52 PM   #6
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QuoteOriginally posted by Baba Joof Quote
I have four Ricoh "P" lenses (28mm, 50mm 1.7, 50mm 2, and 105 Macro) with the pin intact and none of them have given me any problems with my K10D and now K20D. I think the problem is only with some of the third-party lenses made for this series.
Baba...Welcome to the forums!

You are correct that some of the Rikenon-P lenses have a "ball-type" pin that causes little or no grief. This is also true of some third-party models as well. While these lenses are relatively safe, there are other Ricoh brand and third-party lenses that have a definite spring-loaded pin that will jam into the AF drive coupling.

So, once again, for the benefit of all readers...

Here are the Ricoh rules:
  1. All Auto-Rikenon (screw mount), Rikenon (vanilla K-mount), and XR Rikenon lenses are safe
  2. Rikenon-P lenses may cause problems on a Pentax AF body. Use at your own risk.
  3. Third-party lenses designed for the Ricoh "P" mount may also cause problems. Use at your own risk.

Steve

(Big Ricoh lens fan. Narrowly escaped, by mere millimeters in a moment of carelessness, mounting a "P as in poison" lens on my K10D...)
08-23-2009, 10:20 AM   #7
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I had an XR 35mm f/2.8 that was very nice, great image quality but I usually used the DA40 so eventually I sold it. I still have an XR 35-70 f/3.5 zoom that I like a lot. All manual operation, but good image quality.

I have been able to get "P" lenses, and the "P" Tamron adapter, off by toggling the AF switch on and off. That will usually pop the pin out. But no guarantees.
08-23-2009, 05:53 PM   #8
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I have the Rikenon 135mm f/2.8 and it is a lovely lens



08-23-2009, 05:55 PM   #9
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How the lens looks like...



08-23-2009, 08:04 PM   #10
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Very pretty lens Creampuff...

Steve

(Always a sucker for camera porn...)
08-24-2009, 08:02 PM   #11
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The XR 28/3.5 and 200/4 I have are optically identical (same internal baffling, same coating) as their Pentax M equivalents. Cosmetics are of course different: the 28 is a M28/3.5 with a 52mm ring!
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