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Originally Posted by RVMD
Take an 8 x 10 grey card. Cover 1/3 of it with white seamless and 1/3 of it with black seamless. Voila!
R
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That will work, although it won't fold up very well. The target I work with is 14" but when you fold it up it fits in a pants pocket (its made with a one of those wire frames that you twist up to fold up). The cloth that is used for the surface is non-reflective, so you get consistent readings. But if you just want a card, you can find them in the back of Scott Kelby's books for Photoshop for Digital Photographers.
Cheers,
rfs