Question about Nikon D100 Digital Camera
If the lens is AF (not AF-S) there is no motor in the lens. A motor in the camera turns a screw in the lens mount to focus it. If it is easy to turn it manually, my first recommendation would be to check that you didn't accidentally bump the focus selector switch to M. The focus selector is the rotary switch below the lens lock button. If it's on M, switch it back to S (for single-frame) or C (for continuous focusing).
Posted on Feb 28, 2009
make sure the lens is properly connected and aligned, if it has been remove recently it may not of been put completely back to the right position causing the contacts to not align. Turn off the camera and remove and then remount the lens. The motors and the cost to replace/repair are almost as much as a new lens. Your lens can and should last a long time unless it has recently been dropped or tried on a camera (forced) the wrong way and the contacts were bent or damaged.
Posted on Jan 08, 2009
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