Custom WB

[Alan]

I don't really use a grey card at all. I always shoot in RAW then just adjust the white balance when processing the RAW files to what appeals to me.
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That's what I do, too. Most of the time, you might have trouble with AWB with tungsten light, but a simple adjustment of the color temp in the RAW converter will fix that. Most other shots are fairly close, so a gray card isn't much use to me.


But, if you wanted, you could use it for various lighting conditions, and keep the file in your camera, for each situation. Then, you could set your custom WB accordingly.