100 in 100: What's A UV Filter For?

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By Bob Atkins

November 29, 2007

A UV filter is one of the most common accessories purchased by SLR lens owners. It is designed to block UV light, i.e. light with a shorter wavelength than blue/violet, and which is invisible to the human eye. If too much UV light gets to the film or digital sensor, it can result in a blue color cast, although though with digital cameras and automatic white balance, you'd probably never notice it...[Read it all]