If your looking for colour accuracy it is a useful tool. Having part of the grey card on the edge of the frame helps serve as a colour reference. You have a know neutral reference for checking and correcting the colour balance in post editing.
For example the Auto white balance may add too much blue to a shot of grass and yellow flowers.
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Rob
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Solar powered Box Brownie Mk2
Captain Sunshine, to be such a man as he, and walk so pure between the earth and the sea.
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