Custom WB using 3 color cards

Started Jul 5, 2013 | Discussions thread
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er3
er3
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Custom WB using 3 color cards
Jul 5, 2013

So I was thinking about getting an 18% gray card to set custom WB. BUt saw these 3 color WB cards. Are they used the same way? As in you zoom in, take a pic & then set the custom WB in camera? Or are these just for post processing?

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