Nikon D300 - Camera is less than a year old. Auto focus point will not move. Autofocus doesn't work. I have two lenses. Same situation with both. I'm trying to figure out if I've got a setting wrong. Best I can tell, autofocus should be ON.
The lock that's around the 4-way button that moves the AF point will stop it from moving. The AF switch (says C,S,M) on the body below the lens release button gets knocked to manual and turns off the AF
Make sure the switch around the rear selector isn't set to "L".
SOURCE: nikon d40 autofocus
Out of the box, I couldn't get a center focus shot. Out of desperation I reset the camera (push info and magnify buttons at the same time). That solved the problem.
SOURCE: Camera won't autofocus
I too had D50 autofocus problems and ended up buying a new D300. I then learned that my issue was in the focus areas. The D50 has five focus areas. As you look through the lens, you will see one rectangle in the center and four to the top, bottom, left and right. You should make sure that the center rectangle is highlighted. Use the round thumbdial on the back of the camera to move the focus area.
SOURCE: nikon d40 autofocus
Look on the left side of the lens. Make sure the button is on A for auto focus and not M for manual. OR not stuck in the middle. Hopefully that will solve the problem.
SOURCE: Nikon 18-200 autofocus lens won't
OK I just fixed it, thanks to Ken Rockwell.com who says:
"Once in a blue moon my Nikon 18-200mm won't focus on my D200. Manual focus works fine, but the lens won't autofocus no matter what I do. It's annoying!
Of course the camera needs to be pointed at something with contrast, lines or texture. Point it at the sky and nothing autofocuses. That's normal.
One time this was so bad I thought for sure I was going to have to send my lens in for service, since nothing would get it to go.
Then I discovered the problem: I had knocked the AF switch on my D200 to M. This switch is easy to knock and I had forgotten to check the obvious. There also is a switch on the lens which is not easy to knock, but I have left the lens set to M shooting at night, and I forgot to return it to A/M the next morning.
This fixes most of my problems.
Rarer is when the lens honestly won't focus. When this happens I turn the camera off and on. If this doesn't fix it, turn the camera off, press the lens release button and rotate the lens back and fourth a couple of times. This will clear any dust off the electrical contacts and focus returns."
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