Red cameras are amazingly awesome, don't get me wrong! Just pointing out some things about sensor cropping that caught me out many moons ago when I purchased my RED Scarlet-X. In hindsight, for this video I should have generated some noise for each of my grey box examples so that you could actually see how effective super sampling is at "reducing" noise for delivery of a lower resolution (8K to 4K or, 4K to 1080p for example).

Oh, and I also should have mentioned that I'm very aware that most modern day cameras (except RED) actually DO sample more pixels than they record, and super-sample the recorded image, in camera. For example, the Arri Alexa Classic "ONLY" records 2K, but it samples 3.2K at the sensor and super-samples that down to 2K...which is why it looks so detailed and beautiful even though it's only 2K. Same with Sony A7 and a6xx series cameras (and GH5, etc) - They sample more than UHD so that the final delivery of UHD is crisper and cleaner.

Meanwhile, why then when you look at a 100% crop from a Black Magic Pocket Cinema camera (original), with a sensor that is sampling at 1920x1080 but also delivering at 1920x1080 does it seem sharper than a RED Scarlet-X (or even Epic-X) at 100% crop? Well, now we have to talk about the OLPF (Optical Low Pass Filter) and other in-camera processing which affect overall detail and sharpness of a recorded image. That's another video!

I should also mention that today's red cameras actually DO let you super-sample in camera, but only to ProRes or whatever intermediate codec they're supporting - not to RAW.

Oh and finally, when I casually say "4K" (DCI 4096 x 2160) I really should be saying UHD (3840x2160) for the examples in the video.

Didn't mean to bash on RED so much hehe....can't help it!