M Barbu , Nov 24, 2006; 11:57 a.m.
Correct me if I'm wrong but I don't think the 20D can take advantage of the faster transfer speeds possible with the extreme IV.OK; you're wrong. ;-) Although it can't reach the theoretical speeds capable by using the Extreme IV, that version is faster on the 20D, as indicated in tests by Rob Galbraith. FWIW, I use an 8 GB Sandisk Ultra II. Based on that, I would fully expect it capable of utilizing a 16 GB CF card.