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Message: <blockquote data-quote="Marcel" data-source="post: 68242" data-attributes="member: 3903">Is it the 18-105 AF-S? The S is the important part. If it has it, it means that the lens has it's own focus motor in the lens. AF-S lenses have a switch on them so they will or won't focus. When autofocus is on, the focus ring won't usually move. This gives you the option of manually fine focusing without changing the setting on the camera. Lenses that are just AF have the focus screw coupled to the camera focus motor and when the auto focus is on, you can't manually correct the focus without switching the camera auto-focus OFF.Hope this helps.</blockquote>