Quote:
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By using a grey card, the camera can be set to a true white balance, resulting in a more accurate recording of all the colours.The older photographic grey cards are not suitable because they are not neutral enough. They were used for judging exposure rather than judging a white balance and colour neutrality.
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About a Grey Card
now, i didn't know that about the card being used for exposure, i've always solely used it for white balancing. but i tend to get lazy and go through the process, forgetting to take it with me, etc.