Go Pro Hero3 with Atomos Ninja2???
 

If you've ever wanted to get the most out of your GoPro and the shot doesn't dictate that you are short of space or in any kind of hostile environment, you can capture externally... like to a Ninja.

I tried it...it works:

Sean J Vincent Blog: GoPro Hero3 with the Atomos Ninja2

Re: Go Pro Hero3 with Atomos Ninja2???
 

This also works for the Sony Action Cam - yes, it puts out a clean uncompressed 108050i HDMI output. I tried it and it works.

Sony HDR AS15 Test Video: Comparison of Native 16Mbps Files with 144Mbps Pro Res Files - YouTube