This $20 USB-powered lens wrap keeps your lenses from fogging up in the cold

As winter draws nearer in the northern hemisphere, it's only a matter of time before you pick up your camera and head outside, only to find your lens has condensation build up right as you're trying to capture a photograph. Usually, you'd be out of luck, but a clever product from Hakuba Photo hopes to make foggy lens elements a thing of the past. It's called the Haida anti-fog belt and, in essence, it's a small USB-powered heater that you can wrap around your lens to keep the optics nice and toa...