Once you have your white balance shot, you need to set that image in your specific camera as the custom balance. Don't worry, this is very easy and the folks at ExpoImaging have supplied guides on disk to step you through this. Once complete, you change your camera to use the custom balance setting; this is as easy as setting the white balance for sunlight, or shadow modes on your camera. You can then remove the ExpoDisc and start shooting. As long as the lighting conditions stay the same, your white balance should be good as well.
For my example below, the first picture I shot, the one on the left was taken in auto-white balance setting on my camera. You can see the colors are washed out. The red is a salmon color and the green is creamy. The one on the right was done using the ExpoDisc. You can see the difference in the richness of color and vibrancy. Other than cropping, titling, and sizing, no other enhancement was done to the photos.
There are two types of ExpoDisc available. First is the Neutral filter which works by passing equal amounts of red, green, and blue light through to the camera's sensor. This allows you to set balanced color. The second version is the Portrait filter. This is designed for portrait photographers and it enhances for more healthy skin tones. This filter first neutralizes, then enhances with a warming effect.
Personally, I found the ExpoDisc was very easy to use and provided excellent results. Considering that a light meter can cost you several hundreds of dollars, starting at $69.99 USD, the ExpoDisc is incredibly affordable, and is usually available for much less if you shop around. I highly recommend the ExpoDisc.
ExpoDisc sizes:
52, 58, 62, 67, 72, 77, 82, 89, 4x5.65
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