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Message: <blockquote data-quote="KWJams" data-source="post: 117078" data-attributes="member: 1926">Not sure if I got this right -- but you adjust / zoom the lens by turning the aperture ring on the barrel of the lens. Then by holding down the shutter release button the auto-focus takes over and you will see a green light in the view finder or hear a chirp when the one of the auto-focus points ( seen in the viewfinder) has found something to focus on and the shutter will release. If you are manually focusing the lens the same method of twisting the aperture ring until you get the composition that you want and then fine tune the focus with the smaller ring on the lens. It is the smaller ring that the auto focus drives to automatically fine tune the focus.</blockquote>