We were frustrated with using the live view image via 2.4 transmitter for several reasons, many of which I'm sure you are experiencing, like serious image delay for still shooting and other live view focus issues. Quadrocopter has made a very interesting mount that will use a small video camera with a 12mm lens. This fits onto the eyepiece of the 5D (one for II, another for III) You feed the output into the xmitter instead of the liveview composite out. Here's what it looks like: Another view: We find that this approach eliminates the image delay when live view is used for stills, and also we enjoy full standard phase based autofocus. It's not perfect and a 10mm or less would probably be better, but our Camera Operator is VERY happy.