4K video = 17 by 9 frame.
Using 4k in a 1080 timeline you can zoom in 200%.
4K is 4096 by 2160 pixels and needs a 8.8 megapixel sensor.
Recording 1920 by 1080p, 10 bit video @ 24 frames per second and in uncompressed 4:4:4 color depth records at 667 Gigabyte’s per hr.
Diagram of closing apertures = increasing f-numbers. In one-stop increments each aperture has half the light gathering area of the previous stop.
