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I possess a Canon EOS 1100D and I'd like to use some old lenses that were used on a non-digital Chinon CM-5. One of these lenses is Tamron, but with the same size of the Chinon ones. Do you know where I could find an adapter to use them on my Canon?

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The Chinon CM-5 uses a Pentax K mount and there are adapters available for about $15 to mount these lenses on your Canon 1100D.

Mike Butkus Camera Manual Library

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Fotodiox Adapter

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The Chinon CM-5 apparently came in two versions that used either a Pentax K mount (a bayonet type mount) or a Pentax M42 mount (a screw mount).

You should be able to get adapter to either type for a Canon EOS, but you'll need to work out which of those two it is.

  • The CM-4 and CM-5 were both Pentax K mount only. The CS-4 was a M42 screw mount. – Mike Sowsun Jan 17 '18 at 12:40
  • That's not my reading from online sources (none of which I'd regard as definitive). If you have a definitive source for that (only K mount, not M42) then please post it. In any case, it's pretty easy for the OP to tell a screw mount from a bayonet mount. – StephenG Jan 17 '18 at 12:53
  • You can download the Chinon camera user manuals and check which mount each camera uses. butkus.org/chinon/chinon.htm – Mike Sowsun Jan 17 '18 at 15:18
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    @StephenG The 'Chinon Universal Bayonet Mount' was identical to the Pentax K-mount. – Michael C Jan 17 '18 at 20:56
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    @StephenG Yes, many Chinon cameras used a M42 mount, but that is not the same as a bayonet mount. They are VERY different. I can't see anyone calling an M42 Screw Mount a Bayonet Mount. Where did you see "Chinon Universal Bayonet Mount" referred to as an M42 Mount? – Mike Sowsun Jan 17 '18 at 22:04
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According to Wikipedia Chinon CE-5

"The camera had a Pentax K mount (addressed to in the specifications as the Chinon "universal mount") with which its lenses were mounted."

So a Pentax K mount to Canon EOS adapter would be the way to go.

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