Luke Trailwalker, you really want the fastest card at 95 MB/s (Sandisk Ex. Pro.), even to test raw video. Your resolution is limitted with slower cards. I dont tend to shoot raw, but my last go was MLV 10bit raw, 1920 at 2:39 aspect. That was continuous, but did not run more than 5min. Heat occurs with raw video, so even if data transfer rate is supported you really have to watch the heat. Low ISO a must (400 max). I found H264 All-I was best with high ISO up to 1600, after which it starts to become dicey. The other thing which can help low light is a decent denoiser software for post, the Mosaic filter really removes moire but to get cleaner image in low light its the noise you have to remove (my main beef with the 80D is that its 60fps video is IPB is even noisier than All-I in lowee light, so I did not see big benefit with 80D).