Last year on a very cold day (-30F) I had some issues with my 400mm f/4 DO II. I simply could not get a sharp shot. At the time I thought I must have dropped it earlier in the day without realizing it because everything was so soft and it looked like the lens was screwed.
Strange thing is, when I got the lens home and warmed it up, the next day everything was fine and it continued to work well at normal temperatures. I know DO lenses are complex beasts so I was wondering if contraction in the cold has a different effect on them compared to other lenses. I have never had an issue with a non DO lens in low temps.
I posted on my blog to see if anyone else had experienced the same thing, and just today someone commented that with the same lens, they too had issues in the cold.
With my own single data point, I had sort of put the issue at the back of my mind as there wasn't enough to go on, but now my curiosity has been renewed with the news that someone else might have had the same problem.
Has anyone else experienced this? Either with a DO lens or maybe a non DO lens?
Strange thing is, when I got the lens home and warmed it up, the next day everything was fine and it continued to work well at normal temperatures. I know DO lenses are complex beasts so I was wondering if contraction in the cold has a different effect on them compared to other lenses. I have never had an issue with a non DO lens in low temps.
I posted on my blog to see if anyone else had experienced the same thing, and just today someone commented that with the same lens, they too had issues in the cold.
With my own single data point, I had sort of put the issue at the back of my mind as there wasn't enough to go on, but now my curiosity has been renewed with the news that someone else might have had the same problem.
Has anyone else experienced this? Either with a DO lens or maybe a non DO lens?