03-09-2012, 05:41 PM
I could answer the question directly if the Sandisk Extreme Pro 90MB/s cards help at all if Amazon UK delivered mine on time today, but that's a rant for another day.
I can definitely feel a big difference in buffer clearing speed between my Extreme III (30MB/s) and the Extreme (60MB/s) cards. I don't know what the upper speed limit the 7D supports though, if the Extreme Pro (90MB/s) is going to be any more noticeable. Putting that aside, if you *really* need to shoot long bursts, flip to jpeg mode and you can keep going until the shutter dies. Of course in that case you can't expect RAW to rescue badly exposed shots so you need to get that right.
Capacity wise, 16GB gets me somewhere over 500 shots or so.
Personally I dislike changing cards in the field, and you know when the card is almost full, something exciting will happen just when you need to change it. So I'd lean towards too big over too small. Then I tend to choose capacity-speed-cost. I had ordered a 32GB Extreme Pro because, at the time, it was only slightly more than the 16GB and going for a slower card didn't save me any money.
As for other brands, personally I hear too many horror stories about the cheap brands or unbranded ones. I'd stick to Sandisk or Lexar myself.
I can definitely feel a big difference in buffer clearing speed between my Extreme III (30MB/s) and the Extreme (60MB/s) cards. I don't know what the upper speed limit the 7D supports though, if the Extreme Pro (90MB/s) is going to be any more noticeable. Putting that aside, if you *really* need to shoot long bursts, flip to jpeg mode and you can keep going until the shutter dies. Of course in that case you can't expect RAW to rescue badly exposed shots so you need to get that right.
Capacity wise, 16GB gets me somewhere over 500 shots or so.
Personally I dislike changing cards in the field, and you know when the card is almost full, something exciting will happen just when you need to change it. So I'd lean towards too big over too small. Then I tend to choose capacity-speed-cost. I had ordered a 32GB Extreme Pro because, at the time, it was only slightly more than the 16GB and going for a slower card didn't save me any money.
As for other brands, personally I hear too many horror stories about the cheap brands or unbranded ones. I'd stick to Sandisk or Lexar myself.
<a class="bbc_url" href="http://snowporing.deviantart.com/">dA</a> Canon 7D2, 7D, 5D2, 600D, 450D, 300D IR modified, 1D, EF-S 10-18, 15-85, EF 35/2, 85/1.8, 135/2, 70-300L, 100-400L, MP-E65, Zeiss 2/50, Sigma 150 macro, 120-300/2.8, Samyang 8mm fisheye, Olympus E-P1, Panasonic 20/1.7, Sony HX9V, Fuji X100.