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Canon lens adapters
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Feb 19, 2024 08:49:50   #
LFingar Loc: Claverack, NY
 
robertjerl wrote:
Why? They work on my crop sensor bodies and the ones I own by Canon do have a protuberance, tab whatever you want to call it that prevents mounting it on a full frame. On the other hand, the Sigma and Tamron crop sensor lenses just use the EF mounting ring and will mount on a FF body. Of course, they are made without the protruding lens element that can damage the mirror. I get anything from a circular image in the middle of the frame to vignetted corners. I have done it just for fun with an ultrawide angle to fairly long zoom lens from Tamron. When I put a 1.4x extender on it there was barely any vignette at all and with a 2x towards the long end of the zoom range no vignette at all.

Now that knowledge and $20 will get you a "Big Mac Bundle" at my local McDonald's
Why? They work on my crop sensor bodies and the o... (show quote)


I agree. It is the extension in the design of the lens body that prevents mounting an EFs lens on a full frame body, not the mount itself. The mounts are the same. The construction is different and prevents the mount halves from even coming in contact with each other. That eliminates any need for different mounts. I never have seen the lens extension referred to as a tab, but, if that is what you are calling it then it definitely exists and is the reason the lenses won't mount.
Some years back MTShooter cut the extension off of a EFs lens as a test. It mounted perfectly.

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