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?
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.
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.