YouTuber Chris Chris captured the above video showing what happens when your camera’s frame rate is perfectly synced to the rotation speed of a helicopter’s rotor: the blades are frozen at the same angles in each frame, making it look like the helicopter is magically floating around with frozen rotor blades.
It’s interesting to see how well the helicopter rotor speed stays exactly the same through the takeoff process. We shared a similar, albeit much more blurry, video of this phenomenon back in 2012.
from PetaPixel https://petapixel.com/2017/03/04/cameras-frame-rate-synced-helicopters-rotor/
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