My 55-200mm lens will not auto focus or auto zoom
SOURCE: Trouble auto focusing
If it's any consolation, I have the same setup and the same problem. I'm now at the point where I'm probably going to have to return the lens as faulty, but there are a few things it could be on yours which you might want to check.
Have you got the D200 set to auto-focus? The selector (on the front of the camera, on the lower left) should be in the S position (as opposed to C or M).
Have you got the lens set to auto-focus? It should be in the M/A position, rather than M.
Have you tried cleaning the contacts? Pop the lens off and give the contacts a clean with the appropriate equipment. Dust on the contacts could be causing a problem.
Failing that, have you tried turning the camera on and off a few times?
I've obviously tried all the above on mine, and now suspect I've got a faulty lens that needs fixing ... which really sucks! Good luck with it, let me know if you get it working.
Dan
SOURCE: Nikon D80 auto focus
I had the same problem but then I realized the lens was not "in" all the way. It had not clicked into place when I changed lenses. This might work for you....it did for me.
SOURCE: Nikon D80 Autofocus problem
Try re-setting the camera? On the D40 it is 'Menu' scroll down one to Custom Setting Menu (a pencil) and click reset 'ok' yes 'ok' this worked for me.
SOURCE: Nikon D40X stopped auto-focusing yesterday
I had the same problem. My issue was with all my lenses. I solved it by going to the menu and selecting the custom setting menu (pencil icon). Then from the right menu select the AE-L/AF-L and press OK. Then make sure it is set on AE/AF Lock. Presto...all my lenses worked on auto-focus.
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