CFast / Compact Flash
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CFast / Compact Flash

This attempt to maintain backwards compatibility risks adding complications, though. For existing users, the camera includes a CompactFlash socket but to cope with greater data throughput, the main slot uses the outwardly similar but physically incompatible CFast format.

We have concerns about the wisdom of using two such similar cards alongside one another in the high-pressure circumstances the 1D X II will be used in. It's a concern echoed by pro shooter Jordan Stead:

'I'll probably stick with [CompactFlash] for now: there don't seem to be enough advantages to CFast if you're not shooting 4K,' he says. 'Also, I'd worry about whether you can accidentally try to mash the wrong card into the wrong slot, because they're so similar. If you're on the sidelines, dealing with runners [running cards back from the camera to a laptop], they're not going to know the difference - I'd worry about them breaking my card reader or bringing me the wrong card.'