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From Jeff Cable
Photographer Jeff Cable has posted an article on his blog about some of the speed limititations associated with using SD cards in the new Canon EOS 5D Mark III.
From Jeff
Well…after some testing I have determined that, if you care at all about high speed shooting or clearing you buffer quickly, YOU DO NOT want to put a card in the SD slot. Why? Because, for some reason unbeknownst to me, Canon decided to build the 5D Mark III with one very fast CF slot which supports the newer UDMA7 protocol and a standard SD card slot which does NOT support the high speed standard (called UHS – for Ultra High Speed).
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