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Curious effect filming a spinning propellor on a mobile

Curious effect filming a spinning propellor on a mobile

Footage from a Nokia N95, but the same effect can be had from most mobiles with a video camera. Simple explanation overleaf.

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Guest: Bob (2609 days ago)
FAKE! I was on a Jumbo Jet and filmed the engines - they didn't change at all. (Then the stewardess gave me a hard time for not turning off my mobile in flight)
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FAKE! I was on a Jumbo Jet and filmed the engines - they didn't change at all. (Then the stewardess gave me a hard time for not turning off my mobile in flight)
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BastardInBlack BastardInBlack (2610 days ago)
Go on then.....explain it !!!!
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Go on then.....explain it !!!!
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Guest: Steven Hawkins' drunk cousin (2610 days ago)
A combination of the refresh rate of the phones video and reflection of the window I reckon mate.
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A combination of the refresh rate of the phones video and reflection of the window I reckon mate.
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Guest: Your name (2610 days ago)
See text under part 2's video. ALl explained there.
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See text under part 2's video. ALl explained there.
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BastardInBlack BastardInBlack (2610 days ago)
So - are you telling me that when you take a photo with your phone it's NOT an instant 'hit' but more of a very quick top-to-bottom scan ???
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So - are you telling me that when you take a photo with your phone it's NOT an instant 'hit' but more of a very quick top-to-bottom scan ???
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Guest: nerd (2607 days ago)
Latest comment: Not fake Bob, it is called aliasing, the distortion that occurs when a continuous time signal has frequencies larger than half of the sampling rate. the propellers are spinning at frequencies higher than the cameras Nyquist sampling rate. Also probably some reflections add to the distortion
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Latest comment: Not fake Bob, it is called aliasing, the distortion that occurs when a continuous time signal has frequencies larger than half of the sampling rate. the propellers are spinning at frequencies higher than the cameras Nyquist sampling rate. Also probably some reflections add to the distortion
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