« on: January 02, 2014, 04:39:46 PM »
If you are after a replacement for the 5D Mark III in 2014, then Canon may disappoint you. Based on history I think mid 2015 is when the Mark IV may be released.
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The 5D3's SD interface is handicapped, testing shows the fastest you can get from it is ~ 19mb/sec, and that's with the fastest UHS-I class 10 cards. Slower cards will get you less than that. This is because the 5D3 Is not compatible with the latest write protocols, unlike its CF interface.
To cut a very long post short.... Most likely user error!!