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Message: <blockquote data-quote="Blade Canyon" data-source="post: 284328" data-attributes="member: 15302">I agree that the darker shots look correct for the chosen exposure/ISO.  Could it be that the aperture blades on your lens are not closing properly for the initial shots, but then come unstuck or something in the later shots?  In other words, it appears the lens is wide open on the early shots, but then closes down to f16 for the later shots.  The EXIF might still show f16, because that's what the camera's trying to do, but in reality the aperture did not close.Have you tried this with a different lens?Also, does a variation in EV make any difference if you're shooting manual mode?</blockquote>