In reply to SeánM:
I use one of these on the few occasions I want to climb with my camera. I use a hand strap (also by peak design) and back it up by clipping a sling through the hand strap and to my harness. It is a little awkward to use but if you are able to use both your hands it works pretty well. Depending on your harness ( I use a Renegade 2) you should be able to position the clip almost anywhere and put it out of the way your gear.