That's where Ikan's VL5 HDMI Field Monitor comes in. With its 5” screen, I was impressed by its
sharpness and color with an output of 800 x 480 px. Its size makes checking focus on the fly that much easier. I used it on the rare occasion that they needed someone to run B-cam, but it also came in really handy for the sit-down interviews with the actors. This allowed me to sit a few feet away from the camera to give the proper eyeline to the subject while still monitoring the camera view and recording progress.
powered my camera could also be used to power the monitor. The VL5 Kit also comes with a standard AC adapter for plugging directly into the wall, and comes with a shoemount, sun visor, and sun hood. When using it with the Cannon 5D II and the 6D, the screen would turn blue for a few seconds after pressing the record button to start or stop a clip, and it takes a few seconds to switch back and forth between playback and live view. Not sure exactly why that is, but later I discovered that the screen barely blinked with the 7D. So my theory is that this is caused by the camera, not the monitor.