Most of us here believe auto white balance is not your friend. We smiled when we learned Expoimaging introduced the Expodisc 2.0. We really liked the original Expodisc. The Expodisc can work with any camera with a custom white balance setting.
The Exppdisc 2.0 can meter for 18% incident exposure and has 2 levels of warming gels, which can be inserted into a recesses on the face of the ExpoDisc. The user can select for warmer skin tones in portraits. With the original version you had to purchase a second expodisc for warmer tones.
The Mount design has been improved as well with a low profile thread. Initially the Expodisc 2.0 will be released with a 77mm filter size. This size can be used with smaller threads by holding the Expodisc in front of the lens. Smaller filters sizes will be available in the future. The best part of the news is that the newer version is cheaper. It will be priced at $49.95.
A full list of details on the ExpoDisc 2.0 can be found here.