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| p.1 #4 · Anyone use SD card as back-up in 5D3 for weddings? |
The fastest possible way to record to both CF and SD is shooting Full RAW to both. Any conversion (including mRAW or JPG) will slow it down, even with fast cards.
The 45mb/s cards (reading around 30mb/s) work MUCH better than the 30mb/s (which actually only read at 10mb/s due to Canon's issue with SD card technology used). It's a problem with the SD protocol and/or firmware. Rob Gailbraith did a massive test using CF cards and SD cards to see which ones performed best in certain cameras. Nikon suffers from slow SD transfer rates as well, just not nearly as bad as Canon.