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Message: <blockquote data-quote="hark" data-source="post: 748089" data-attributes="member: 13196">I can't answer the question about the clicking. If you purchased the body new, did you check the shutter count to make sure it was new?As for the f/2.8 aperture on a macro lens - it won't always stay at f/2.8 even if that's what you have set on the body. It has to do with the distance and whether the subject is at 1:1 or further away. At 1:1 most likely the body will compensate automatically and stop down the aperture. As you get closer to infinity, then the aperture should be at f/2.8. Maybe this will help explain it:<a href="https://www.dpreview.com/forums/thread/3476331" target="_blank">https://www.dpreview.com/forums/thread/3476331</a></blockquote>