I shoot with the Sony a7S II, and I’m really happy with the images it produces. Unfortunately, it’s also limited by a codec which restricts it to 8-bit, low data rate video capture. In the real world, this manifests as digital artifacts that reduce the resolution of your footage and make it harder to color grade. I use the process below to clean up my footage before editing, but I’d recommend this workflow for any 8-bit video or footage with visible noise.
Digital noise is one of the biggest obstacles to high-quality video. Whereas analog noise can be aesthetically pleasing, digital noise looks cheap and pixelated. It’s a combination of the noise of your camera sensor (created by amplifying light, more prevalent at higher ISO values) and the artifacts created by the codec (created by compression, more prevalent at low data rates). A high-quality denoiser can make a world of difference on your footage; I’m using Neat Video, and I’ve been really impressed by its capabilities. Here’s a dramatic example (click here for full-size):