Hello ! I wanted to use a ninja 2 on my 700d, but as you said, no clean HDMI output. No clean HDMI until... ML ! When you are in the ML menu, go to the Display settings, then look at the option "clear overlays", it gives you the option to get a clean output when you want ! For example you can set it to trigger only when you launch the recording ! No more overlays on the screen. 