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Message: <blockquote data-quote="Blade Canyon" data-source="post: 369847" data-attributes="member: 15302"><p>For exposure (as opposed to white balance), you do not need to do a new grey card reading for different items.  In fact, that's the whole point of the 18% grey card.  It lets you set the metering correctly for the light in manual, and prevents exposure changes that happen when your subjects are different colors or levels of brightness had you been using camera metering for each shot.  So long as your lighting stays the same, just calculate the correct exposure one time with the grey card, lock those settings in Manual mode, then shoot away.</p></blockquote><p></p>