Expo Imaging - How to use FAQ
How do I use the ExpoDisc?
The ExpoDisc is far easier to use than any grey 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. Using an ExpoDisc custom white balance will virtually eliminate the need for RAW or JPEG post-capture colour adjustments.
ExpoDisc technology takes a unique approach to setting a custom white balance and producing accurate colour. The ExpoDisc essentially uses your camera’s built-in custom white balance capability to turn the camera into an incident colour-metering tool. By setting white balance as an incident filter rather than as a reflective target, the ExpoDisc avoids the common problems and inconveniences associated with using gray cards, white cards and calibration targets: unwieldy size, unwanted reflectivity, improper angling and difficulty of filling the frame.
What size lenses does the ExpoDisc fit? Do I need to buy an ExpoDisc for all my lenses?
The ExpoDisc works with any digital SLR and digital video camera with a white balance function. ExpoDisc filters are available with quick pressure release friction mounts (in standard sizes, including 52mm, 58mm, 62mm, 67mm, 72mm, 77mm, 82mm, as well as 4x5.65 Video Format Filters). If you have multiple lenses, you can start by purchasing an ExpoDisc that fits your largest lens and the holding the ExpoDisc flush over smaller lenses.
Does the ExpoDisc work for video applications?
All ExpoDiscs work just as great for video applications as they do with still cameras. The ExpoDisc excels as a video white balance tool, especially in situations where a videographer needs to quickly set white balance while on the move. In addition to ExpoDisc round filters, we also make an ExpoDisc Video Format Filter which is large enough to fit over many video camera lenses and has a convenient grip-handle.