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Embarrassingly loud I think and perhaps caused at least in part by the need to accept EF-S lenses. A selectable quieter mode would be welcomed by me.

I had a 10D for a while and the difference to the 20D was immediately noticeable. I can't remember what my 300D was like.

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True, the mirror has to move backwards slightly in order to clear the rear of the EF-S mount......... I continue to wonder, based on these sorts of drawback and the excellent quality achieved by the likes of Sigma and Tamron using the normal EF mount, why Canon persist with the idea.......