Oct 062011
 
sunshine

Cameras in cellphones do not have a mechanical ‘shutter’ as in conventional cameras, but scan an image line-by-line as is typical in video cameras. When shooting a moving or rotating object, the shutter scan interferes with the subject’s motion and results in some odd images — very much like the “backwards wagon wheels” you see in old movies and TV westerns.

Check out this rubber propeller, caused by the action of the shutter against the motion of the airplane engine

This animation explains why

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