My Nikon D50 with AF-s DX 18-55mm lens, autofocus will not autofocus, manual focus works excellent but I can't get the autofocus to work! Help! I have tried everything I know to try to fix it- resetting all the settings, going throught everything trying to change it but I just went to use it and overnight it decided it didn't want to autofocus... is it broken? Do I have to buy a whole new lens?
I just encountered the same problem. The advice giver who forced the focus ring with autofocus engaged was right on the mark. (Thanks!) Actually, I didn't need to force it, just gave it a firm push. Voila!
Same happened to mine ,Its almost as though the motor has dis-engaged.I SOLVED MINE BY FORCING THE FOCUS RING WITH AUTOFOCUS ENGAGED THIS SEEMS TO HAVE RE ENGAGED THE MOTOR .HOWEVER BE CAREFUL I HAD LITTLE TO LOSE MINE WAS STILL UNDER WARRANTY WHEN I DID THIS.Its perfect since.
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That lens will work with the D3100, except for the autofocusing. In order to autofocus with the D3100, you need AF-S lenses, such as the AF-S VR Zoom-NIKKOR 70-300mm f/4.5-5.6G IF-ED or the
AF-S DX NIKKOR 55-300mm f/4.5-5.6G ED VR.
Auto-focus technology on this camera is controlled by several contacts on the mount that physically mate with other contacts on your lens. It sounds like your mount may be malfunctioning due to wear and tear (if cleaning does not work). This is between $100 and $300 fix depending on which part(s) need replacement.
Your diopter may not be adjusted ( adjustment for sharpness of image in viewfinder on the side of the eye-piece ) so set that first and then try again. If this is correct then your camera is focusing accurately ( on the sensor ) but only the image in viewfinder looks unsharp.
First try another lens on the body and see if the problem is the lens or the body,if its the body the autofocus mirror could be out of adjustment, if its the lens, it sounds like the lens took an impact and needs a pro repair. you should be able to set body to manual focus and focus lens to infinty.