Set the lens and camera to manual focusing. First, move the focus-method switch on the lens to the manual position. The setting is usually marked M or MF. Next, you need to set the camera to manual focusing by setting the Focus mode to MF. (Get the job done via the Information display control strip.) Yes, you should be concerned if you are a professional photographer. Here are some quick troubleshooting methods to fix Nikon Autofocus issues. Follow these steps, in this order: #1 Check whether the lens is clean. Remove the lens. Examine the front and rear lens aspects for dirt and dust. Check also if there is any damage and filters on the lens.
Sidenote: why not use a kit Nikkor 18-55mm DX, it has same lame f/3.5-5.6 but adds VR and longer tele (~70mm equivalent for nice portraits) for less money. Also I believe there is no 50mm DX lens in existence. I personally played with D3100/18-55VR couple of weeks ago and I should say it is a terrific combo.
The 55-250mm AF-S has an A/M focus switch, which has to be set to A. If you've done this, and the lens still isn't working, Nikon can answer your questions better than we can. If your lens is AF, rather than AF-S, it has no built-in motor, and therefore Can't autofocus on a D40, D80, or any of the D3xxx and D5xxx series. Take the lens off of your camera. Put the lens in MF mode. Twist the FOCUS ring (the tip of the lens) all the way to one side (extend it). You may hear a click noise or two, this is good, but don't FORCE the lens. Twist the FOCUS ring all the way to the opposite side (retract it). Again, you may hear a couple of clicking noises.
If you can't get a focus confirmation when focusing manually and or don't get aperture confirmation when setting aperture then the chip in the lens may have failed. One thing you can try is to mount the lens, on camera body switch from AF to Manual then back again. I had one lens not focus once and after doing that the lens started working again.
xdIm.
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  • nikon 18 55mm lens autofocus not working