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I am looking to purchase a 7d and currently have an XT. How do I find out if the lenses I have are compatible with the my new potential camera?

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This is great, lets see how many identical answers we can come up with! –  dpollitt Nov 24 '11 at 0:22
    
One thing the other answers don't cover is that all the lenses that work on XT will work on 7d.. :) –  Sridhar Iyer Jan 5 '12 at 23:11

5 Answers 5

Canon EOS bodies can accept two types of lenses, EF and EF-S mount. EF work on all and EF-S only work on crop sensor bodies. Both the XT and 7D are crop sensors so they accept either EF or EFS lenses. If you were to purchase a full frame body such as a 5D mrk II or 1d X then you could only use EF lenses on those bodies.

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They are all compatible. Both have the same mount and sensor size.

On most DSLR brands other than Nikon, that is all you need to know.

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Out of curiosity, does the "other than Nikon" part refer to Nikon G lenses lacking the aperture ring? Or something else? –  Michael Kjörling Nov 23 '11 at 13:57
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No. Nikon lens can autofocus via an electronic or a mechanical link but not all Nikon DSLRs have the mechanical link, particularly none of the entry-level ones. So a D3100 or D5100 will not autofocus with a AF lens and requires an AF-S one. A D90, D7000, D3X or D3S can autofocus with both types of lenses. The lens will mount and be usable with MF on all these cameras. –  Itai Nov 23 '11 at 14:04
    
Thank you! (filler) –  Michael Kjörling Nov 23 '11 at 14:31

All Canon lenses (EF & EF-S mount) should be compatible. In fact, some of the correction features like peripheral illumination correction will be enabled for lenses that came out between the XT & 7D.

However, 3rd party lenses like those made by Sigma & Tamron may not work.

Quoting from a review of the Sigma 17-50mm lens:

My standard disclaimer: There are some potential issues with third party lenses. Since Sigma reverse engineers (vs. licenses) manufacturer AF routines, there is always the possibility that a DSLR body might not support a (likely older) third party lens. Sometimes a lens can be made compatible by the manufacturer, sometimes not.

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That is confusing when you call it peripheral illumination correction. Also known as, vignette correction! –  dpollitt Nov 24 '11 at 0:22
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@dpollitt Yes, I just used the Canon jargon. In a layman's terms, I'd say it corrects corner darkening that is inherent to a lens. –  ab.aditya Nov 24 '11 at 2:17

ALL of the lens that you can currently use on your XT can be used on the Canon 7D.

Reason: they have the same mount. If it doesn't work on the XT it will not work on the 7D

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YES.

All your lenses used on the XT (350D?) can be used on the 7D. I should know - I went from a 350D to a 7D and took all my lenses with me ;-)

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