I presumed this was possible, but I just read on a youtube comment that it was not. Is this correct?

Thanks,

Ben.

Not possible. Sucks, doesn't it?

Not possible. Sucks, doesn't it?
The SD bus probably doesn't have the bandwidth to handle 5DIII video. If you've worked with ML Raw you know how slow the SD bus is. SD cards can be fast enough; hopefully Canon will come up with a faster bus for future cameras.

The SD bus probably doesn't have the bandwidth to handle 5DIII video. If you've worked with ML Raw you know how slow the SD bus is. SD cards can be fast enough; hopefully Canon will come up with a faster bus for future cameras.

I record video all the time to the SD card in my 5D MK3. It works fine. You just can't record simultaneously to the CF card.

I record video all the time to the SD card in my 5D MK3. It works fine. You just can't record simultaneously to the CF card.
Cool. I've always used the CF card.

Cool. I've always used the CF card.

I like being able to just stick the card in my iMac. I need an adapter and USB with the CF card.

Related topic: Is there a way to shoot video to CF, and stills to SD?

Related topic: Is there a way to shoot video to CF, and stills to SD?

Yes.

p116 of the manual [Record Func + Folder Card/Folder Select]

First menu under the spanner.

Choose Rec. Separately.