ExpoDisc - For Accurate White Balance

ExpoDisc

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Setting accurate “white balance” is easy with Expodisc. I have used it in offices with weird tungsten lighting. I have used it for street scene night shots in Las Vegas. Using ExpoDisc even helps me get better exposures in open shade, and at different times of the day. And, one disc the diameter of your largest lens is all you need to purchase.

http://www.expoimaging.net/