Science & TechFact
Why propellers look like bent bananas in phone photos.
Your phone's sensor doesn't capture the image all at once but line by line from top to bottom. If something moves fast, the lower lines are read later than the upper ones: propellers curve, cars lean sideways, handheld footage wobbles like jelly. This is called rolling shutter. Pricier cameras with a global shutter read every pixel at the same instant.
Useful: Photograph rotors or fans and expect art rather than reality.
Source: en.wikipedia.org