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larryt wrote:
My brand new sigma sport 150 to 600mm stops auto focusing in temps of 14*. After 30 min. in the cold it will not auto focus. Back in the car to warm up a little then it will focus. Happens every time I take it out in the cold. I will be getting this info to sigma so in the mean time if any one has experienced this problem or doesn't when out in the extreme cold please post here or send a PM to me. thanks, larryt
What body are you using it on?
It's about 11 degrees where I am at right now near Chicago. I put the lens mounted to a D4s outside, still somewhat dark at the time, for about an hour. It started getting light so I went out and had no problem with focus. Even tried to defocus completely, AF came right back when I pressed the shutter button . Another good test is to see if you can point up with the lens since this takes more power to focus than if shooting straight on. Sigma had a huge problem with this issue when the first 120-300 OS lens was released, which I owned at the time. Again, no problem for me.
Perhaps it is a battery issue with the body you are using.
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