![]() ![]() Buffer +Ī critical factor – perhaps the most important for sports and wildlife shooters – is the number of shots you can rip before you get the unpredictable stutter of a full cache. This number – reported in the viewfinder for those who have it set so – will vary mostly based on the ISO setting, as that will affect the size of the files.) This is Walt the blue-winged teal, our test subject. (The cache will appear to be about 60 shots deep because fast cards will allow you to fill up about half again as much data during the time it is uploading to the memory card. In the Canon EOS R5, this appears to be about 2 GB of data, or about 40 shots. This is the time it takes to completely move the contents of the cache to the card. All that said, the SanDisk 512GB card are tops at clearing the cache, as the chart above shows. With CFexpress, buffer clearing times are just less important. When shooting SD cards on the Sony a9, it seemed you could do your laundry and have a little time left for a snack while the buffer unloaded to the memory card. In the old days (2019), the difference between cache clearing in one card to another could easily have been more than 15 seconds. If clearing the buffer is the difference between 4.5 and 6 seconds, it might not be as big a priority as it used to be. That the memory cards can eat up the full buffer so quickly now has implications for people thinking about which factors are most important. The buffer is that on-board, super-fast memory that fills up, and then you’re just left with the raw speed of your memory card, chewing through what the buffer can upload to it. The cards are all so fast that the difference between the top performer in clearing a full buffer and the card that came in second from last is just 1.5 seconds. It has to be said that the CFexpress format is a leap forward. Note: The comparisons below were shot on a Canon EOS R5 camera. ![]() They’ll offload images and video faster than the others.īiologists call a flock of CFexpress cards a “kidney” of cards
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