Canon 5D Mark III Memory Card Compatability
Canon 5D Mark III is compatible with CF (CompactFlash) and SD/SDHC/SDXC memory cards.
However, not all memory cards have been verified by Canon to work with the camera.
Verified CF (CompactFlash) memory cards
The following CF memory cards have been verified to work with the Canon 5D Mark III for shooting or playing back still images or movies (as of March 2012).