ExpoDisc 2.0 - The original white balance filter for digital cameras. Set an accurate custom white balance for photo or video, meter in-camera for 18% exposure, or dust map your image sensor with the only calibrated and certified 18% transmission incident light metering filter. Whether shooting in RAW or JPEG, using the ExpoDisc to white balance your camera saves valuable time in photo editing software. ExpoDisc saves time editing white balance in photos and video when used to set a custom white balance. The ExpoDisc consistently produces excellent color in natural, artificial, and studio lighting, and it even excels in difficult mixed lighting environments. Easier to use than a gray card, white card, or calibration target. Simply place the ExpoDisc in front of your lens and capture the incident light while setting your camera?s custom white balance. For most cameras, this procedure takes only about 15 seconds. No software required. Set your custom white balance in-camera then simply download your images ?as shot?. The ExpoDisc 2.0 is available in 77mm and 82mm filter thread sizes. It uses a push button mount design to attach quickly and securely to 77mm and 82mm size lens filter threads. If you have lenses smaller than 77mm you can still use the ExpoDisc 2.0 to set you white balance or meter for 18% exposure by simply holding a larger ExpoDisc flat against the end of a smaller lens. Manufactured, assembled, calibrated, and packaged in the USA from US and imported parts.