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Old Oct 21, 2006, 6:02 PM   #1
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Will this lens work on my 20D?

28-70mm f/2.8 EX Aspherical DF Autofocus Lens for Sigma SA

Sorry to post this question in two places I just need help before I buy.
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Old Oct 21, 2006, 9:46 PM   #2
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I do not think so. from the description that is a Sigma lens made for a Sigma camera.
You can get the same Sigma lens with a Canon EF mount and it will then work on the 20D.

The Sigma cameras do not have the same mount as Canons.

RP33 wrote:
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Will this lens work on my 20D?

28-70mm f/2.8 EX Aspherical DF Autofocus Lens for Sigma SA

Sorry to post this question in two places I just need help before I buy.
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Old Oct 22, 2006, 7:36 AM   #3
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The Sigma SA mount is mechanically different form the Canon EF mount; However their protocol and electrical interface are similar...
If you go to the Sigma forum(s) there's a few thread discussing the replacement of the mechanical rear mount - Folks even use 'modified' Canon lenses on Sigma body
-> Watch out for the Sigma SD14... :idea:
If its follow-on tests show any promising Dynamic Range results then we could have the best of both world here in a Foveon sensor: DNR and sharpness of cropped 'digital lens' only without the need for Full-Frame
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