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Old 10-05-2012, 09:25 PM   #14
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Join Date: Nov 2006
Posts: 11,202

Kevin, doesn't the gray card capture the temperature only at the card itself? How does that work if you are shooting a subject 50 yards away? Do you have to walk down to where the train is going to be, walk back to the tripod, shoot the card, set the camera, walk back down to get the gray card so you don't have a gray card in your shot, walk back to the tripod, wait for train, shoot?

Or is the gray card useful only where the light at your feet is the same or similar to the light in the scene? And what if you are in shadow but the scene is lit?

And can one presume that in a scene with mixed light from sources of different colors, the card is useless?
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