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05-10-2016, 04:44 PM   #1
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M42 original adaptall mount and KS-2

I picked up an original Tamron adaptall lens (135mm, f2.8) today with a first generation m42 adapter on it. I can't get it all the way on my KS-2 because of a protruding gear that scrapes against the body overhang above the lens mount. Can I grind down the gear cover enough for it to fit? Should I try to find a different adapter? Would an adaptall-2 K mount adapter work? I have one of those. Ideas appreciated!

05-10-2016, 06:22 PM   #2
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That is not a straight M42 adapter and is fairly rare. IIRC, it is designed to allow open-aperture metering on the Pentax ES and similar cameras as with the SMC/S-M-C Takumar lenses.

FWIW, neither the regular adaptall nor the one you have will work with your K-S2 without modification. There is no A/M switch to allow full manual operation.


Last edited by stevebrot; 05-10-2016 at 06:27 PM.
05-10-2016, 08:33 PM - 1 Like   #3
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Thanks for the insights. You're right; it's marked for the Pentax ES. Strangely enough, though, the lens does have a manual/auto setting - so I think that, if the adapter had screwed on without hitting the overhang, it might have worked for that particular lens.

Now that I'm home, I've tried the PK adaptall-2 adapter on the lens and it works wonderfully. So I'm happy about that.

Maybe I'll try to sell the ES adapter on the Marketplace - see if anyone wants it.

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