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10-01-2019, 04:18 AM   #1
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K-mounts compatibility

I do have a K10D camera over here, the manual says it has the KAF2 mount for lenses.
I also do have a Pentax MG, it's manual says it has a K mount.
Is it safe to mount the lens of the MG on the K10D?
Yes, I could simply try it, BUT I do not want to damage something and for sure, don't want to end with the 'wrong' lens locked up in my K10D (as this is the most modern I have).

Thank you for your help on this.

10-01-2019, 04:37 AM   #2

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Yes you can mount every old pentax lens on your K10D (I think there was 1 exception but if it fits on the MG it will fit on your DSLR).
There are probably not all features of your DSLR available, depending on your lens you can maybe just use the M mode.
Third party lenses sometimes have a bigger protection shield next to the aperture lever than original pentax lenses and those have to be removed or trimmed down for the lenses to be mounted on a DSLR (it won't mount at all in that case so it can't get stuck).
Old Ricoh lenses on the other hand can get stuck on the camera because of the Ricoh pin, you will find more information in the forum on how to recognize and transform them into a usable lens

Last edited by othar; 10-01-2019 at 04:54 AM.
10-01-2019, 04:43 AM   #3
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Yes, perfectly safe. From the PF K10D page:

All Pentax K-mount lenses except for lenses with the KAF4 mount variant. Support for lenses with the KAF3 mount variant requires a firmware update. Manual focus only with K-, M-, and A-series lenses. Stop down metering only with K- and M-series lenses. M42, Pentax 645 and Pentax 6x7 lenses with the appropriate adapters (stop down metering and manual focus only).

Read more at: Pentax K10D - Pentax K-mount DSLRs - Pentax Camera Reviews and Specifications
10-01-2019, 04:50 AM - 2 Likes   #4
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If they are third party lenses there are a few caveats.

1. "Ricoh pin". Ricoh P series lenses, and third party lenses compatible with Ricoh p cameras, can have a pin that gets stuck in the Pentax AF screw drive before the lens is fully mounted. Not all such lenses are dangerous, just the ones with narrow flat sided pins.

2. The "Vivitar" aperture guard. Many third party lenses have an extended aperture guard. This will prevent the lens from being mounted because of the PZ/SDM electrical contacts inside the mount. The guard can usually be removed by removing a few JIS screws. Or it can be cut down with a dremel...

10-01-2019, 05:49 AM   #5
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The Pentax Camera Lens Compatibility Chart

This should help explain the details.
10-01-2019, 08:58 AM   #6
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QuoteOriginally posted by boriscleto Quote
"Ricoh pin"
+1 for avoiding the Ricoh pin
10-01-2019, 09:10 AM - 1 Like   #7
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QuoteOriginally posted by FozzFoster Quote
+1 for avoiding the Ricoh pin
But it is easy to remove - just research "remove Ricoh pin" on the Internet
10-01-2019, 09:21 AM   #8
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QuoteOriginally posted by reh321 Quote
But it is easy to remove - just research "remove Ricoh pin" on the Internet
Thanks for the tip! I never even considered that! hahh

10-01-2019, 09:43 AM   #9
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All K-Mount lenses fit phyiscally all k-mount cameras. the differences are in the protocolls and availability of certain functions.
The Ricoh pin is the biggest thread because when you want to unmount it, it can cling to your camera. So double check and in case of the pin and quick test of the lens, tape it down... If you like the lens, you still can modify it
10-02-2019, 04:41 PM - 1 Like   #10
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QuoteOriginally posted by FozzFoster Quote
+1 for avoiding the Ricoh pin
+2 for avoiding the Ricoh pin!
10-03-2019, 10:49 PM   #11
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K mount is also extremely compatible with M42 too unlike Canon which has a lot of mirror clearance issues. There's a couple exceptions (namely Fujitsu stubs, but those are easily removed with a metal file) but it's almost negligible. Pentax has always been about backwards compatibility even from the olden days.

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