The ExpoImaging ExpoDisc 4 x 5.65" Video Format Filter - Neutral solves the problem of color balancing difficult video shooting scenarios. With this accessory, you will not have to carry additional cards and targets with you to balance your light. Consisting of multiple layers of carefully selected materials, the ExpoDisc is guaranteed to be within /- 2% of neutral for demanding professionals. The ExpoDisc acts just like an 18% gray card when used to measure the incident light, and, as such, can be used instead. The sophisticated design enables the ExpoDisc to receive, scramble and passively transmit mixed light from a wide angle in front of the disc through to the image sensor for a more accurate and efficient white balance correction. Simply take a reading with the ExpoDisc installed and your camera will automatically compensate for any color shift it perceives White Balance solution for digital video Spend more time shooting and less on workflow Balance your color at capture Replace your gray and white cards ExpoDiscs are available for professional lenses in six standard sizes from 52 to 82mm. Additional sizes are available in 4x4 and 4x5.65 configurations for professional video filter box systems from Arri, Century, Chrosziel, Lee, and Schneider