It doesn’t make super-slow video if you play it back at the same rate at which you took it. But that’s not what happens.
Instead they take those 10,000 fps and they play them back at a much slower rate, generally something like 30fps. Because the playback is much slower than the rate it was filmed, this results in slow motion.
The reason you have to take such high frame rates is because if you just take 30fps video and play it back really slowly, you’ll get huge jumps between motion. At that rate, you won’t be able to see fast things like bullets at all.
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