Canon faced some modest compatibility risks when it chose to design its new EOS Rebel XSi camera with SD flash-memory cards rather than the CompactFlash cards it's used for all its SLR cameras until this point, but I think the move is smart overall.
It's a drag for consumers that there's such a profusion of flash card formats. Customers often must pay extra when moving from one camera maker to another just to replace flash cards. And indeed, owners of Canon's existing Rebel, Rebel XT, or XTi cameras will find their CompactFlash cards useless if they upgraded to an XSi.
But the reality is that Rebel XSi (also called the 450D and Kiss X2 in various parts of the world) customers are more likely to be upgrading from a compact camera, a market where SD dominates. And from a technical perspective, SD performs fine, takes up less critical room in the camera, and in the newer SDHC incarnation can match CompactFlash's 32GB capacity.
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