With a field-of-view of 140deg, you need those pixels to really be able to see detail at any normal distance. Think about pointing a camera at your driveway trying to catch some porch pirates or someone that dumped some crap on your lawn - can you see their license plate from a distance?
Do the math. How many pixels will a car license plate (12inches wide) be at 30ft away with a 140deg FOV? Assuming it's perfectly head-on.
- At 1080 (1920px horizontally) resolution, it will be 34 pixels wide.
- At 2k (2560px horizontally) resolution, it will be 45 pixels wide.
- At 4k (3840px horizontally) resolution, it will be 68 pixels wide.
30ft isn't that far. But a license plate at that distance will be REALLY small with a 140deg FOV. At 34px wide, it would probably be totally illegible - a single letter would only be a few pixels wide, no way to differentiate between any letters, and keep in mind most of the time it won't be a perfect head-on shot but rather at an angle with some blurring. Even at 4k the license plate will be barely legible, each letter would be 5-6 pixels wide - that might be enough to differentiate between M and W.
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I might have missed it in the spec, I thought 2k was 2560x1440.