I use 8GB Lexar Professional UDMA 300x and the SanDisk Extreme III and IV, which are also UDMA cards. Since my 50D can take advantage of the UDMA they are the only cards I ever use. I have found very little difference in camera speed using any of those three cards, but the 300x Lexar and Extreme IV upload to my computer a little faster. Since both manufactures were aggressively rebating them the last couple years as I was acquiring them, the prices were pretty reasonable. I do get @2-6 more images on the SanDisk (I shoot RAW) than the Lexax, depending on settings/conditions.


Rob Galbraith has done some pretty detailed speed testing on the cards and various cameras. If your camera is listed, it is quite informative.


I am waiting for the 1D Mark IV to get listed. It will give me one more reason to covet it...[Y][]


Here is the link:


http://www.robgalbraith.com/bins/mul...e.asp?cid=6007



I hope this helps,


Chris