> 
> 
>                  . . .  Canon made a marketing decision to
> deliberately drop support for some functions in the 300D.
> 
> But their decision not to support the new wide-angle on the existing
> bodies is a technical one.  That lens protrudes too deeply into the lens
> mount, and owuld interfere with the mirror.  The 300D has a complex
> mirror mechanism that allow it to "clear" the rear-element of the new
> wide-angle.

Is that true?  Or does it just have a smaller mirror?

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