I've tried all the configurations and have settled to shooting only CF in the past 6 months. I own a grundle of cards and always have at least 2 with me so I have yet to run out of space. I have had a poor relationship with SD cards,too fragile for me and I dislike the slider switch. All RAW except for the occasional b&w jpeg shoot for kicks.I used to hate forgetting to switch the card slot after removing the CF when I shot dual slots, using only the CF solves that.
These are the sort of issues I want to know about before I will invest in an SD card. So how about the following scenarios?
Let's say I have a 4GB CF and a 32 GB SD. While shooting I fill the CF and remove it. Will the camera then continue on the SD card only?
And let's say I remove the CF and replace it with a fresh 4GB card, will the camera then continue recording on the SD where it left off?
It will do what you tell it to do. Write to one. Write to both, Write to one then the other. And all these configurations in all manners of file formats. And yes, if you remove a card it will automatically write to the remaining card regardless of previous configuration.
And even when the camera is "off". If you leave the card door open and replace the cf card it will stay on the previous setting. However as soon as you close the door it will switch to the SD card.
I reported this issue to Canon and it was fixed in the 1dx but not in the 5diii.
I just use the usb to download now and leave the cards innthe camera. Lots of reports of bent cf pins so i reduce that risk by just leaving thm in the slot.
Thanks for your comments. I think I'll just go and play around with it a little to get a feel for it
5D3, 5D2, Sony α6000, S90 | SY14 f/2.8, Ʃ20 f/1.8, 24 f/2.8, 35 f/2, Ʃ35 f/1.4A, 50 f/1.8 I, Ʃ50 f/1.4 EX, 100L Macro, 17-40L, 24-105L, 70-200 f/2.8L IS II, 1.4x II, 70-300L, 100-400L | E-mount: SY12 f/2, Ʃ19 & 30 f/2.8 EX DN, 16-70 ZA OSS, 55-210 OSS, Metabones SB | FT-QL, AE-1P | FD(n) & FL lenses