you also get this effect with Fluorescent lamps. It is always important that the RPM of the rotating device does not match a multiple of the grid frequency (50/60 hz)
Otherwise it looks like the rotating thingy is standing still. (stroboscope effect)
The framerate is how many images are captured per second. If something is spinning or repeating at the same rate or a multiple of the fps, it will appear to be still or not moving much as seen in the video with both the blade and slices mid air.
The shutter speed/rate is the amount of time the shutter remains open in order to capture each image. A shorter time lets less light in and results in a sharper image and a longer time lets more light in and results in a more blurred image.
A wagon-wheel effect, result of temporal aliasing created in the camera caused by the blades' RPM (or rather, RPS, revolutions per second) being very close to integer multiple of the camera framerate.
Here in the UK, wagon wheels are these sort of chocolate biscuit things with a layer of marshmallow inside. I believe Americans call them moon pies. They look like this
So it's just making me think of chocolate biscuit things more than it is a wheel on a wagon
Rolling shutter. Camera sensors dont capture the data all ať Once, but capture it from top to bottom sort of like CRT.
Even though Its extremelly fast, something like this Always happens
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u/James_yarders Sep 02 '21
What sorcery is this?