Bob49 Offline Upload & Sell: Off
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15 degrees F should be no problem. I've used the R3 in sustained events (2 hours without breaks) at that temperature and below, most recently for three days in a row at about zero and below. One day was minus 4 and lower for two 90-minute sessions. The R3 worked fine. About 8400 frames a day, and changing battery only once a day. The camera went inside for maybe 30 minutes, to warm up operator, not the R3 (which stayed wrapped in vapor barrier in a cold back pack).
There were sometimes two problems that were operator issues: fingers too cold (even with chemical packs in gloves) to find and operate shutter button consistently, and too cold to hold camera body so that fingers would not sometimes accidentally hit back AF buttons and throw off focus. But the camera itself worked fine. (For the first problem, I'm going to pad the shutter button to make it easier to find and press. For second, thinking about a grip strap to hold R3 body more securely, and maybe disabling or reassigning back buttons in those conditions.)
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