Different capacity on sd and cf

[NYCPHOTO]

Hello All,

On my 5D3, I usually shoot with both cards ( 32gig ) capturing raw for insurance.

It seems even if I format both cards before the shoot, one card fills before the other.

This doesn't seem to make sense to me.

I don't remember which fills first but it definitely happens.

Any explanation?

Thanks..Arnie

 

[viggen61]

1) if you save RAW to one card, and JPEG to the other, the card that gets the RAWs will always fill sooner, because RAW files are a lot larger than the same image as a JPEG.

2) if both cards get the same files, the format can cause the actual, formatted capacity to be different than the labeled capacity, and/or different between types of card.