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sick string footage

No, you were seeing an effect called "Rolling shutter distortion". What it is: A camera shutter moves vertically, exposing only a small part of the image onto the recording medium (film, digital sensor) at one time. As it moves down, the string moves sideways, causing the appearance of a diagonal line, even though the string really is quite straight.

Here's a better explanation of the phenomenon:
[Invalid or Expired Link Removed]
 
No, you were seeing an effect called "Rolling shutter distortion". What it is: A camera shutter moves vertically, exposing only a small part of the image onto the recording medium (film, digital sensor) at one time. As it moves down, the string moves sideways, causing the appearance of a diagonal line, even though the string really is quite straight.

Here's a better explanation of the phenomenon:
[Invalid or Expired Link Removed]

Plek did some high-speed videos of strings vibrating to design their machines. This gif is from one of them. The effect is very similar, so I think that the rolling shutter distortion is not the full story.

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