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I'm trying to find the correct lens mount or adapter to use with my Canon T3i. The mount has patent number 3500735 and says "For Canon".

mount

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    For future reference, what make/model is the lens? (Eg.,what does it say on the other side?) – mattdm Feb 26 '15 at 0:16
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    And if you have a more-clear photo, that'd be awesome. – mattdm Feb 26 '15 at 0:17
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The "For Canon" is a pretty big hint, narrowing things down significantly. Since it's clearly not the current "EOS" mount, the obvious guess is that it's the previous manual-focus Canon mount, called "FD".

Your image is kind of blurry, but a quick Google search or a look at a guide like this one on Keh.com (thanks @Blrfl) will confirm this — it's Canon FD.

You can find adapters fairly easily (like this one), but note that because the flange focal distance of the older mount is shorter, the adapter needs to contain glass in order to retain focus at a distance, which means that (especially with a $40 adapter) image quality will be compromised. (So, basically, unless you're just doing it for fun, it's not necessarily worth it.)

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The mount pictured is for Canon FD. For comparison, see What is the breech mount on this Hanimex lens?  Canon FD is not a good mount to adapt to EOS cameras with EF/EF-S mounts.

However, the patent number 3500735 and exposed gear on the side indicates that the mount shown not on the lens itself, but on an adapter for a Tamron universal mount. I would need more pictures to see which adapter it is, but I would guess it is for the Adaptall-2 bayonet mount. If that is the case, you can get an Adaptall-EF (Tamron-EOS) adapter to use the lens with your Canon camera. To detach the existing adapter from the lens, you need to press a tab on the side to release it.

Mounts that can be adapted to EF/EF-S include:

  • M42 and T2 screw mounts
  • Nikon F/AI/etc mount
  • Olympus OM mount
  • Pentax PK mount
  • Tamron Adaptall mount

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