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Old 10-06-2012, 12:45 AM   #18
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Join Date: Jan 2008
Location: Massachusetts
Posts: 2,010

Originally Posted by JRMDC View Post
I won't say I understand gray card use yet, but it does seem to me that unless one finds a spot in one's "mixed lighting situation" where all of the various sources of light are blending, then the card cannot help. So if a foregound is sodium light and a background it not, then I don't see the help.
Hi J,

As per my previous post, you are completely correct. If the gray card is not exposed to the same lighting as your subject, it will not help you. A gray card is simply a calibration standard. It is a way to show your camera's sensors what 18% gray looks like under your current lighting condition.

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