I've been pondering changing from my 50D to either a 7D or a 1D Mk3. I use the C1 and C2 settings on the 50D to give fast access to different set ups, obviously the 7D has three of these. As far as I have been able to ascertain re the 1D Mk3, up to 10 user defined and user named set ups can be stored to card and changed via going into the menu. If this is the case can I keep a dedicated SD card in the camera purely for different camera set ups, so I can can quickly change mid shoot as needed? (I don't think I'll be shooting to dual cards) Or have I missed something obvious and there's a different (faster?) way of changing camera set ups.