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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It’s called the “rolling shutter effect”. Named after film cameras that used a shutter that swiped across the film from one side to the other. Phone cameras gather information from their sensors in a similar way. They sample each image in a stripe starting from one side and ending at the other, over and over again, to make a video.
Because of this, something that’s moving very quickly, like a vibrating guitar string, will appear to bend as it moves. The string was in one position for the first stripe of the sensor, but it moved slightly before the sample was taken from the next stripe of sensor. If you do this quickly and repeatedly, the string appears to vibrate in a wave pattern.
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