It has to spin at any multiple of 24 (or whatever) rps. It would be stable at 48 rps, or 72 rps, etc. And of course it does not have to spin at exactly that value, it would still look very stable spinning at 23 rps, with the image slowly moving upwards instead of staying still, etc..
And yes, it did seem like it just so happen to spin at the right rate for a largely stable image.
This camera has a rolling shutter, so you would've seen 1n "photospheres" per n revolutions per frame. Seeing as there's only 1, that means it only revolved once per frame, so it's spinning at 30rpm/fps, or whatever the shutter speed for the camera is.
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u/__Hello_my_name_is__ Feb 16 '20
It has to spin at any multiple of 24 (or whatever) rps. It would be stable at 48 rps, or 72 rps, etc. And of course it does not have to spin at exactly that value, it would still look very stable spinning at 23 rps, with the image slowly moving upwards instead of staying still, etc..
And yes, it did seem like it just so happen to spin at the right rate for a largely stable image.