Original image resolution IS related to image quality, in more ways than just image sharpness.
Starting with a big image and scaling it down (supersampling) is actually very similar to having larger pixels in the first place. I.e. in RED ONE 4K's case, each pixel of 1080p footage wil be averaged from roughly 4 pixels. This reduces the noise by 12 dB.
Supersampling is also necessary to reduce aliasing problems.
RED's specs rate scarlet's dynamic range to be twice as good as RED ONE (each stop means twice the info from the sensor).
RED ONE's full screen rolling shutter is about 1/80 sec - better than other current CMOS cameras.
But 3/4" as Scarlet can shoot 120 fps with full sensor, the rolling shutter time simply *must* be less than 1/120. That's as good as 35mm film (yes, that's where the term originally comes from).



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