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Extra Batteries
Cold temperatures slow down the chemical processes inside batteries for cameras and other gear, shortening their performance time. Make sure you carry some extras with you when you're out in the cold, since you'll need to switch fresh batteries in more frequently. If possible, carry spare batteries in a pocket close to your body to keep them warm. The good news is that the cold doesn't actually drain batteries completely, so once you warm a chilly battery up again after it seems to have run out, you'll probably find that it has some juice left.
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Hand Warmers
Keeping a few hand warmers like these from Grabber in your bag will not only help you keep your fingers operational but also let you warm up batteries. Some camera covers have pockets that you can slip hand warmers into in cold weather.
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Photographer's Gloves
Listen to your mom, and don't forget your gloves when you go out shooting in the winter. If you have a camera or camera phone with a touchscreen, a pair like these Agloves Grip Touch gloves will let you operate your touchscreen and keep a firm grip on your gear in the cold. Another option is a pair of photographer's gloves with pull-back fingertips.
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Tripod Leg Warmers
If your favorite tripod is made of metal, it can get hard to handle in the cold. Fortunately, poodles and ballerinas aren't the only ones leg warmers are made for. You can pick up some tripod leg warmers like the Aquatech Tripod Soft Wrap shown here to let you handle your tripod comfortably. Just remember: Never lick metal tripod legs in the winter.
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Lens Coat
Lenses can get unpleasant to handle in the cold, too. You can keep your lenses padded and protected from the elements with a lens coat like this one from LensCoat. The company also makes tripod leg warmers.
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Plastic Bags
If you're shooting out in the cold, condensation will form on your camera when you go inside. Seal your camera inside a plastic bag like a large Ziploc before you go in to keep the optics from fogging up.
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Camera Cover
Your Tenba bag may have a built-in rain cover, but your camera probably doesn't. You can use a camera cover like the Camera Duck to protect your camera from rain, sleet, and snow. It has built-in pockets for hand warmers to help keep your gear warm, and is available with camouflage and reflective surfaces.
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Anti-Fog Cloth
You can keep your lens and viewfinder from fogging up by giving them a once-over with one of Nanofilm's Clarity Fog Eliminator Cloths. The cloth applies an ultra-thin dry coating that causes moisture to evaporate from the optical surface before condensation can form.
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Dehumidifying Caps
Some photographers keep a few silica gel desiccant packs in their camera bag to help protect cameras and lenses from moisture. These lens and body caps from BRNO let Canon and Nikon shooters put a protective desiccant right on their gear.
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Middle Gray Cleaning Cloth
Having a microfiber cleaning cloth or two in your bag is a good idea year-round, but it's especially important when the weather gets wet. Carrying a middle-gray cloth like this SoftClean Cleaning Cloth from Promaster will also allow you to use it as a metering and white-balance target in bright, snow-covered landscapes. Unlike a gray card that might be damaged if it gets wet, a gray cloth can be used in the snow.
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