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03-01-2011, 09:36 AM   #1
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Ricoh Rikenon P 50mm 1.7 on a K100D

Hey there.

There's a Ricoh Rikenon P 50mm f:1.7 prime I'm thinking of picking up on the cheap. I know about the Ricoh pin, having removed it on another lens to avoid problems mounting on my K100D, so that's not a big deal.

What I need to know is, will the "P" on the aperture ring work the same as the "A" on a Pentax PK-A lens? Some say it will, others say it won't.

Cheers,
Bobbo :-)

03-01-2011, 10:47 AM   #2
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I have the same lens on my K100D. The pin does not need to be removed.
"P" is no use. Just use manual mode anyway.
03-01-2011, 12:05 PM   #3
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QuoteOriginally posted by GibbyTheMole Quote
What I need to know is, will the "P" on the aperture ring work the same as the "A" on a Pentax PK-A lens? Some say it will, others say it won't.
No, it won't. The aperture ring contacts for Ricoh are in a different place on the flange than Pentax, and they likely don't speak the same signals even if they did line up.
03-01-2011, 12:10 PM   #4
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Original Poster
Thanks for the info, guys. I'll probably just try to find a Pentax PK-A prime on the cheap.

Bobbo :-)

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