Setting white balance with one of these?

Started Dec 26, 2012 | Discussions thread
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Waterengineer Contributing Member • Posts: 874
Setting white balance with one of these?

Has anyone used one of these disks. "Expodisk"?  Gimmick or does it work?  Thanks.

http://www.adorama.com/searchsite/default.aspx?searchinfo=expodisc+&emailprice=t

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