I recently bought a D7100, upgrading from a D50 that was six or seven years old. I have two lenses: a Sigma DC 18 - 200mm and a AF-S Nikkor 18 - 55mm. I have had good results with the Sigma, but have had consistent focus problems with the Nikkor. In just about any autofocus setting I've chosen I get "chatter" (i.e, subject coming in and out of focus) when I'm composing a shot. Most of my pictures with the Nikkor lens are not in focus. Am I doing something fundamentally wrong or is it possible that the older Nikkor lens is not capability with the new D7100? Any insight or suggestions would be greatly appreciated.
Yes, I've had it set at AF-S, but I'm still getting the chatter, by which I mean that the focus keeps adjusting itself and won't give me the green light to shoot in the form of the solid dot. When I final click the shutter, I get an out-of-focus shot.
For further info, I've chosen the following settings:
For AF-C and AF-S I have it set at focus (not "release") Focus tracking lock is off Focus point wrap-around is off Number of focal points: I only see a choice between 51 and 11
Are you shooting in lower light levels? This sounds a lot like what my 80-400 VR (1st version) does when I team it up with a Tamron 1.4x. As soon as I take the 1.4x off the lens locks right on.
When I zoom this lens out to 400mm it's at f5.6, but when I put the teleconverter on it is an f8 lens. Since most of these cameras aren't able to autofocus at f8 except for just one of the autofocus sensors, this could be the problem.
I also have the 18-55 non VR lens and it seems to have focus hunting issues for me, as well. Typically in lower light. Although I have had some problems in better light with low contrast targets as well.
Granted, my copy of the 80-400 isn't a speed demon for focusing, anyway, and saddling it with a teleconverter only adds to focus errors.
This poor low light performance with this lens has got me to thinking I need to get better glass. And gotta feed the NAS, too. Now just trying to decide if $6000 for the 600 f4 or the Sigma 300-800 5.6 for another $1500+ becomes the issue.
Try using this lens on a fairly bright daylight type of shot with a lot of contrast for the autofocus to lock on to. See if you can find someone in your area with a Lens Align target or even a checkerboard pattern to try focusing on. The checkerboard patterns can be made easily with PS or you can get a real good copy of one from Adobe with their lens profile tool for PS. You can find more info for it at http://www.adobe.com/support/downloads/detail.jsp?ftpID=5490.
I have never tried to clean them but someone on here will respond to you for the correct method and materials to use. My suggestion was due to my background in electronics and from my experience in reading these forum posts. When a lens acts strange, wants to hunt and not focus correctly etc. it's probably a good first step to take, especially since the problem seems to be lens related and not camera. Try not placing your hands under the lens and lock focus with one hand and shoot or better yet on a table or tripod. In other words get your hand away from flexing the lens underneath or otherwise. If it starts to work you probably have bad or intermittent surface to surface contact. Larry
Use a drop of DeOxit on a Q-Tip to clean the electrical contacts on both the lens and the camera body. Also inspect the contacts on the lens and make sure they all project out the same distance. They are spring loaded and can get jammed in.
Hello, I tried cleaning the contact bumps in the camera with a paper tissue and some alcohol. This was a big mistake. The paper tissue shredded all over and I am sure some of it got on the sensor. Also I think the alcohol partially softened up the rubber seal. The tissue really stuck to that. Don't do what I did!!! At least I did it on my D70. Bill
It's not what you look at that matters, it's what you see" Henry David Thoreau (1817-62)
Try using a single AF point. Preferably the center point which is the most sensive and accurate.
BTW: When you used the word "chatter" the my first thought was a problem with the VR mechanism. Thus the question about which version of the lens you had. I see now that you ment the AF system is "hunting" and does not lock focus.
Thanks to everyone who responded to my original post. I have concluded that I have a lens-to-body contact problem. Thanks to lautry, who first suggested this. My conclusion is based on entirely different/better focus performance using my other lens. Also, given the cautionary notes about doing your own cleaning, I'm decided to get my 18-55mm professionally cleaned.