Features:

The SystemPRO Professional White Balance Lens Cap diffuses incoming light to create an average color temperature for any given scene. Use your camera's manual white balance feature to capture the most accurate color photos with your digital camera. Great for use in difficult lighting situations.

Averages color temperature of all light in a given scene
Provides accurate white balance measurement
Works with any digital camera that has manual white balance feature

Available in sizes from 49mm - 77mm