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In the USA I've observed in conditions near 0 F (-18 C) on a 2 or 3 occassions. Remember being at 9000 ft in Idaho doing a series of hand guided 10-15 minute exposures of Comet Hale-Bopp. I had the car heater running so every couple of minutes I could leave the guiding eyepiece and warm my hands. I had trouble operating with gloves, so removed them. It was almost unbearable and after about 2 hours of that my hands were burning from the cold!
Terry
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