Why when I look at a guitar string when I play a guitar, it vibrates really fast in my eyes but, when I watch a video of [https://www.youtube.com/watch?v=XOCGb5ZGEV8](https://www.youtube.com/watch?v=XOCGb5ZGEV8) with a camera, the guitar string vibrates in a wave that is very noticeable?
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Your eyes are constantly taking in light across your whole field of view. Cameras only record a certain number of frames of imagery at a time. Many cameras, such as the one filming this video, don’t even record the entire frame at once: they record one line of a frame at a time, which is called a [rolling shutter](https://en.wikipedia.org/wiki/Rolling_shutter). As you can see in that page, this can cause distortions if the thing being recorded is moving very quickly compared to the speed of the shutter. In the case of your video, the strings are moving back and forth so fast that even in a single frame they’re recorded at being in different spots. In some parts of the frame, a string is recorded at being on the left, and in some parts they’re recorded as being on the right, which makes the string look like it’s bending back and forth dramatically. But the string never actually bends like that in reality, it’s just a distortion caused by recording different parts of the string at different parts in time.
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