The effect is real, but cameras actively try to suppress it. Cameras have a map of particularly bad pixels which are ignored (much like a bad sector map in a ha

The effect is real, but cameras actively try to suppress it. Cameras have a map of particularly bad pixels which are ignored (much like a bad sector map in a hard drive), and when doing long exposures most cameras will/can do two exposures, where the second one is made with the shutter closed. I'm skeptical this works after boiling 24...50 megapixels down into a tiny web-sized image with 1-3 MP.