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Warts: hot and dead pixels

Hot pixels, caused by dark current (false signal in absence of light), show up as dots in long exposures

Hot pixels are not a problem except at exposure times on the order of 1 second or longer

Virtually all digital cameras have some hot pixels in numbers of a few to dozens or more depending on exposure time

Dead pixels are failed pixels that show up as dots under all conditions but are often invisible depending on scene

Dead pixels are generally few or none

Hot and dead pixels are generally easy to correct with the clone tool in Photoshop

Snow Goose, Sacramento NWR

 Pluses and Minuses of Digital SLRs            © Robert Harrington 2004