Canon EVF-V50 OLED Viewfinder for C500 Mark II

It is not. This cannot be used on the C200B.

Yes.

The Canon EVF-V50 Viewfinder has a resolution of approximately 1.77 million dots and a 1920 × 1080 resolution, making it suitable for critical 4K applications. The connection to the camera is a custom Canon connection to the C500 Mark II.

I wouldn't add a 3rd party EVF to this cam. It will add a whole set of new problems for what will likely be just a marginal improvement in image quality if there even is one. I use a Gratical Eye on a Red Komodo. It's a pain. First, you'll need to find a way to get power to it, which will likely involve using a different battery with a D-Tap. Then if the EVF doesn't have a power switch, you'll find yourself having to unplug it to save your battery life between shots. But probably the most irritating thing to me is the little nipple-switch menu/shortcut control. Seems every time I go to adjust the position of the EVF, that get's tapped and I unintentionally activate a function like peaking, which I may already have active in the camera. In any case, if I were buying one of these Canons, I would also buy the "fitted" EVF.

This viewfinder is not compatible with the C70.

The manufacturer does not provide specific details to define whether or not this unit can be turned off and we have found no switches, which would allow for that process to occur.

At this time, Canon does not state that the Canon EVF-V50 OLED Viewfinder for C500 Mark II is compatible with the Canon EOS C400 6K Full-Frame Digital Cinema Camera (Canon RF).