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Message: <blockquote data-quote="nickt" data-source="post: 465527" data-attributes="member: 4923">I'm taking this to mean that you did lock your lens at the minimum aperture. Try wiping down the lens contacts. Mount and dismount the lens a few times to make sure it is seating properly. Also gently move the little aperture lever poking out the rear of the lens while it is off. It should move easily to control the aperture with a spring return. You could also check deep in menu f5, there is a setting for aperture to control with ring or sub command wheel. Normally we would set to sub command wheel, but you could try setting it for aperture ring control. Not sure how that affects newer lenses, it might disable the camera with a G lens installed.</blockquote>