Have you guys considered the low cost, light weight option of the Android tablets or iPad for controlling your camera? For the Canon 5D ii I chose a Samsung 7 inch tablet (~ $170) and the dSPLR ($9) controller app. I mounted it to the tripod leg with a RAM clamp (~ $50). Large display from Live View, all camera controls remote, pull focus from A to B, HDR, HDR + pull focus, etc., etc. Lots of pluses and a few minuses: Hard to focus in some lighting conditions, not waterproof at all (that is what plastic bags are made for). You xn even use your phone in a pinch with this software.