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Message: <blockquote data-quote="Joseph Bautsch" data-source="post: 17459" data-attributes="member: 654"><p>The difference between a AF-S and a AF-D lens is that a AF-S has the focusing motor built into the lens. The AF-D lens does not. In order to have a AF-D lens "auto focus" you have to have a body that has the lens focusing motor built in that body. If you do not have a body with the built in focusing motor then a AF-D lens will not auto focus. While a AF-D lens will work on the D3100 you will have to manually focus. So the answer to your question is that a "D" lens will absolutely not AF without the built in auto focus motor. The only way to have AF on a D3100 is to use a AF-S type lens. See page 196 of your users manual. It has a list of the lenses that can be used with the D3100 and the functions each supports.</p></blockquote><p></p>