Milt26 wrote:
The Nikon 18-200 does not have weather seal rings in the extension tubes. I dusty conditions, such as southwestern US shooting, I discovered a coating of dust had visibly collected on the backside of the front element. I found I could unscrew the front element, clean the area and the problem was gone. Not something I'd do with a pro-priced lens, but effective. The original version also suffers from"lens creep" while carrying it. Otherwise a pretty nice general purpose lens.
I've heard about people removing the front element to clean it, but that's not something I'd like to try. Do you need special tools to loosen the collar?