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Message: <blockquote data-quote="WayneF" data-source="post: 207311" data-attributes="member: 12496">I may not grasp the questions meaning, but if your menu C1: Shutter Release Button AE-L  is ON, then half pressing and holding just the shutter button will lock the metered exposure (and focus too, in AF-S mode), regardless if you shift the camera away to a new place.  You don't need the other button.   Be careful of Spot Metering.  It does NOT mean the Spot will be "correctly exposed".  It merely means the Spot will come out middle tone, not too dark, not too bright.   If you picked a proper spot that ought to be middle tone (for example, an 18% gray card), then you will like it.   If you picked a human face, you won't.   This is simply how light meters work.</blockquote>