"Also, you can shoot 4K using the entire image sensor, but it crops down."
What does that mean?
In my understanding it's either "the entire sensor" or a crop of it, so which is it?
Understandable. I shoot exclusively with Kubrick's NASA 50mm f/0.7, the corner resolution is impressive. "Accept no substitute!" I often say to everyone around me.
Function is nice, which is primary of course. Just wish it wouldn't look so ugly, though. Reminds me of my $25 ebay mattebox from 10 years ago :/
This has nothing to do with FOV equivalency and a camera being "full frame" or not. As he mentions several times - you should familiarize yourself with YOUR setup - your camera and your sensor size. Equivalency would only matter if you mastered this technique on a certain sensor size and now you're shooting on another and need to make adjustments, which is not what the video is about.
This already exists in 3D Lut Creator:https://www.youtube.com/watch?v=k0YQNm7TlNM
But let's see if this happens to work better.