WmPat wrote:
I'm using 8Gb Extreme IV 45mb/s 300x cards. Haven't done any tests yet, nor pushed burst shooting to it's end. The thing I noticed, coming to 7D from MkIIn, is that the camera writes to the CF card, and clears the buffer, a lot faster than before. I used to have to look to see if the red light was off before reviewing my bursts. Now, the red light is always off and I can chimp right away. There's a big difference between the two cameras when using the same cards.
I'm using the same cards, and if I fill 2 of those, I have a 4-gig of the same speed. Then I drop down to the slower cards. I can't imagine where I'd have the need to use any of my older Extreme II cards but I still have a couple.
My rough test of speed and burst capability with RAW images:
8-gig Extreme IV UDMA (45 mb/s) - 25-26 shot burst, 2 shot pairs every 2 seconds afterward.
4-gig Extreme IV UDMA (45 mb/s) - same
4-gig Extreme III - 23 shot burst, 1 shot every 2 seconds afterward.
4-gig Extreme II - 20 shot burst, 1 shot every 4 seconds afterward.
You can see a longer burst with the faster card as well as quicker buffer clearing times. The 5D2 has similar results, though with a somewhat smaller buffer (in terms of the number of shots it will hold).
One of my partners has a 7D. We covered a Youth Football Championship (5 games) last weekend. I wanted to try the 7D so I shot all five games with it (1d3 as the other body). I shot large Jpegs at all drive speeds. I ran Ultra II's;III's & IV's. We ran cards every quarter and I could not tell what card was in the camera. I know this wasn't too scientific but it was real world.
