I was about to buy some SanDisk Extreme III 8GB CF cards, but the ones I went in for are apparently discontinued. The new SanDisk Extreme 8GB cards are UDMA-5 compliant, but does that mean they won't work in a 40D or a <span style="text-decoration: line-through;"]50D, since those bodies aren't UDMA, or does it just mean they won't reach their maximum speed potential?


Also, it occurred to me that SanDisk has rebates at times, and I wondered if that may be happening again soon. Last time, buying multiples just about gave you a free card, and I am looking at getting several.


EDIT: Apparently the 50D is UDMA compliant. So the question is more for the 40D at the moment.