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06-08-2011, 10:13 PM   #1
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KR mount Lens

Im looking at a Sears 135mm lens but it says it has a KR mount.... not sure what that is, will the lens mount to a K20D??


Thanks fro any help

06-08-2011, 10:21 PM   #2
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It is a Ricoh/Rikenon K mount lens. It will mount but.......

Be very very careful of the 'Ricoh pin'

The difference between K mount and KR is a tiny pin which has no use on a Pentax camera, but may get caught in the AF drive of the K mount and get the lens stuck on your camera.

The pin can be removed if you are game enough to open the lens, or ground off using a small Dremel or similar.
06-08-2011, 10:34 PM   #3
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Yes, it should be very easy to remove the lens back plate from your lens and get rid of the offending pin (by the way, it's the one more or less diametrically opposite the red dot). The dremel sounds a bit nasty (and unnecessary) to me.

Do not be tempted to mount it on your camera until you've done this!
06-08-2011, 10:37 PM   #4
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Original Poster
Cool.... thanks for the advice.

06-09-2011, 06:44 AM   #5
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Bear in mind that there are two varieties of Ricoh pins -- the actual protruding pin, which should be removed; and a rounded nub, which is no trouble. I have never encountered the toxic pin. I have read that if you hold a KR lens and manipulate the aperture ring and levers, the pin will extrude. So, that's a test to see if you need to pull the lens apart, remove the pin, and reassemble. Various threads here discuss that minor surgery. Good luck!
06-09-2011, 09:06 AM   #6
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It's a snap to remove the Ricoh pin. Takes 5 minutes. Here's how:

theatre of noise: Ricoh Lenses On Pentax Cameras -- The Ricoh Pin Fix

Cheers,
Bobbo :-)
06-10-2011, 07:27 AM   #7
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QuoteOriginally posted by GibbyTheMole Quote
It's a snap to remove the Ricoh pin. Takes 5 minutes. Here's how:

theatre of noise: Ricoh Lenses On Pentax Cameras -- The Ricoh Pin Fix

Cheers,
Bobbo :-)
Bobbo: Thanks for the link. I need to remove one of those soon.
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