Camera’s shutter speed syncs up perfectly with the helicopter rotor
Cameras are able to record video by rapidly opening and closing a small shutter, which captures an image each time it opens. So, when your camera’s shutter is opening and closing at the same rate as a helicopter propeller, this happens.
Read more: http://www.wimp.com/cameras-shutter-speed-syncs-up-perfectly-with-the-helicopter-rotor/
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