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Message: <blockquote data-quote="pistnbroke" data-source="post: 132197" data-attributes="member: 9514">look on the back of the lens .....mount end of the lens ...count the little metal contact pins ...if it only has 5 then it wont work with the 3100 as you have purchased the wrong lens its a worm drive.cam drive lens ...If its got 6 pins then you have selected something wrong in the menu.( or its faulty)OR you have not realized that you need an edge to focus on ...camera will not focus on a plain white wall so maybe not on a cloud. You may need to select maual and set it at infinity .Also as your object is basic ally white you may have to reduce the exposure using the +/- button near the release to get a good picture.</blockquote>