Photographer Chris Empey has published a review of the Expodisc, a filter that goes in front of the lens and is used to set a custom white balance for your digital camera. Prices vary from $79.95 to $159.95 (plus shipping) depending on the filter size.

“I first saw the ExpoDisc in Action at a Monte Zucker seminar and wasn’t sure how necessary a product like this was, especially in controlled situations like when using studio lights. After using the ExpoDisc, I am convinced that even though the auto white balance feature on digital camera’s is always improving, they can still be improved upon. Using the ExpoDisc takes only a few seconds, yet provides more accurate results than the in camera auto white balance, or even the preset white balance options.”

Website: Chris Empey - Expodisc Review