How can I keep my camera focusing well when it's very cold out?
I recently did a portrait shoot where it was around 10 degrees Fahrenheit (-12 Celsius), using my Canon EOS 50d, and 50mm f/1.8 STM. I found that my autofocus was performing far below what I'm used to. It would hunt slowly for a second or two, only locking about half the time.
I want to do some more shooting soon, but it's even colder now, with a low of -27 f (-32c). I don't want to go out and find that my camera won't lock AF.
Thanks for any tips!