Video cameras take multiple pictures a second and present them one after another to simulate motion. It’s like a flipbook, but with pictures!
The modern standard is 24-30 pictures taken in one second. So seeing 30 pictures a second is what your eye is “accustomed” to. Most if not all of the movies and tv shows you watch are in 30 frames per second, so you are presented with 30 pictures, one after another, in one second to simulate motion, like a flip book.
Old cameras only took 12-15 pictures a second. So when you watch those old videos with your eye that is accustomed to 30 pictures in one second, anything less than that seems like it’s moving “faster” because there are less pictures being presented in sequence.
30 pictures in one second to simulate motion
vs
15 pictures in one second to simulate motion
Less pictures per second means more dramatic difference in movement between pictures, which makes it look like everything is moving faster.
It’s not moving faster, you’re just seeing less.
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