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This $20 USB-powered lens wrap keeps your lenses from fogging up in the cold: Digital Photography Review
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A dew heater wraps around the lens, keeping the body warm. It creates heat via a power source, typically by connecting to a small USB power bank. By keeping the glass warmer
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Lens Heater USB Dew Heater Dew Remover Lens Warmer For Nikon Canon Sony Fujifilm Olympus Lens Telescopes Condensation Prevention
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