I went out for a walk to try some things on the new to me 1DX, ie. an RRS L plate, tripod and 10 stop ND filter. However there was too much breeze on the water for what I wanted, but the settings I'd loaded to C1 came in handy instead. I'd set this up as "grab and go" for action if needed, 1/2000 sec, Auto ISO, f5.6, high frame rate. I'd not used Auto ISO on my previous cameras because I didn't find the higher ISOs too good, but no reservations now with a much greater range and mostly usable. Quite handy that an oarsman hove into view . . .