wolverine wrote:
I recently got a 20mm 2.8 USM lens. It is the widest I could afford for my D60.(I didn't like the 20-35mm). Until today I was very pleased with it. I live in Canada and today it was -8 deg Cel. I was trying out some landscape shots with my new lens, only to find when I downloaded them, they all had a fuzzy spot in the middle. Until today, all my images were taken inside, and have been excellent. Today was the first time my camera was used in such cold weather, so I thought it may be the camera. I ran some tests with one of my other lenses(28 1.8), and had no problem at all. Does the cold affect some lenses? Or do I have a faulty lens? Any help is greatly appreciated!
Isn't that the same effect you get from frozen water vapor inside the lens? If it is not frozen, then is it simple waper vapor condensation. First of all, it might not be sealed perfectly. Even if it is sealed, it might be unavoidable if you are moving the lens quickly between temperature extremes.
Now, if it is NOT in the lens, where else could it be? On the sensor? If it shows up in the finished image, then that confines it to either the lens or the sensor. If you did not see it through the viewfinder, then that suggests the sensor rather than the lens.
I had a bad condensation problem in a cheaper camera one time, and I simply opened it up and placed it in a rather warm place for about one day, and then 99% of the problem had gone. But I am not sure how much heat I would want to apply to an expensive camera or lens.
---Bob Gross---
