I’ve had this lens for about a year and use it on my D40. About a month ago I started noticing problems with the autofocus. DX lenses from Nikon have their own focus motor so that they can work on the D40, D40X, and D60 which lack an internal focus motor.
The problem with the lens is that the autofocus motor is overdriving the focus. Then, my D40 recognizes that the frame isn’t in focus and sends a signal to the lens telling it to correct. The lens then overcorrects and the cycle repeats itself. This is what is known as autofocus “hunting”. I’m not exactly sure what has caused this problem with my lens but a lot of other people who own it have had the same problem.
So that leaves me to send the lens off to Nikon to have it looked at and repaired. The lens carries a 5 Year Warranty so it shouldn’t be an issue to get it repaired. It will be more of a hassle than anything else to ship it off and wait for it to be repaired and returned.
If you’re thinking about purchasing this lens, I would probably look at some other lenses from Nikon first or even a third-party lens from Sigma or Tamron. You will likely have a better lens on your hands and won’t have to worry about this issue.
Have a great 3-day weekend and I’ll see you back here next week!