Problem with 18-200 at 18mm
I've been using my Nikon 18-200 (on my D300S) for a few years now and the only problem I've ever had with it is some heavy vignetting at maximum zoom. Today I had it out and have a problem at the other end, 18mm, the large dark blotch at the top centre of the photo (see attached). I've used this lens on this camera in this kind of lighting many times before and at similar settings (using aperture mode) and never experience this before. I wanted to set up for a bracket set and then I discovered what might have been my problem: I thought the aperture setting was at 5.6 (and it was when I started out) but I noticed it had somehow been changed to f22 (and 1/40). Could the small aperture and wide angle result in what I've described above?
Attachment#1 (jpg file)
#1. "RE: Problem with 18-200 at 18mm" | In response to Reply # 0aolander Nikonian since 15th Sep 2006Mon 26-Aug-13 05:03 PM | edited Mon 26-Aug-13 05:49 PM by aolander
If you're using a lens hood, do you have it on correctly? Also, at small apertures, dust/dirt/smudges on the sensor will be more visible. The "vignetted" area in the image isn't typical lens vignetting which occurs in the corners of an image.
I don't think vignetting with this lens is too bad at apertures smaller than f/5.6.
#2. "RE: Problem with 18-200 at 18mm" | In response to Reply # 0dm1dave Nikonian since 12th Sep 2006Mon 26-Aug-13 05:40 PM
This could be a large dust spot on the sensor. I would use the auto sensor cleaning and then use a blower on the sensor.
Then go out and shoot just the sky at f/22 and see if the spot is gone. If not try the same shot with a different lens.
#3. "RE: Problem with 18-200 at 18mm" | In response to Reply # 0MEMcD Nikonian since 24th Dec 2007Tue 27-Aug-13 08:45 PM
Since the spot is visible at f/22 I would suspect a dust bunny on the sensor.
If the problem continues after you clean the sensor via the camera menu you should try using a Giottos Rocket Blower to clean the sensor.