400mm DC Lens Warmer – Lens Dew Heater Strip Stepless Temperature Regulator Condensation Prevention for Telescopes Camera DSLR Lens Telescope Eyepieces Less Than 5 inch (125mm) in Diameter

If you live in, or vacationing/visiting, a hot, humid, environment the USB Lens Warmer is a marvelous addition to your camera bag. Going outside from a comfortably cold and dehumidified area (in my case a 73 degree home with air conditioning) into the hot (90 degree plus) and humid Florida air causes glasses to get all fogged up – the same is true for you camera lenses.How do you prevent the glass from becoming steamed up and opaque due to that mist on the lens? You surely don’t want to wipe your very expensive camera lens with your shirt or a paper towel. A microfiber cloth does better but is not great. Instead of those I’ve quickly come to rely on these lens warmers which will heat up the lens enough so that the mist will not form on, or will be quickly dried off, the lens.The other day I saw a bunch of children playing on the dock across from my home and I wanted to get a picture of them and their cute antics. I grabbed my lens and wrapped it in the lens warmer and very quickly I was able to go outside and take the pictures I wanted without having to wait a long time until the lens warmed up by the ambient air or without having to try to wipe the lens dry without streaking.The Tydeux USB Lens Warmer does an admirable job of heating your lens to your desired temperature so that the fog does not form on the lens or will be quickly “burned off.” This lens warmer wraps around your lens and is held in place by a velcro like fastener strip. It can be plugged directly into either a wall charger or a portable power bank and the degree of warmth governed by an integrated stepless heat regulator. That way your lens can be heated to a ‘fog free” temperature before you take it outside or, if you are already outside, you can heat the lens up using your power bank and quickly make the lens “fog free.”The Tydeux USB Lens Warmer is a marvelous device to prevent, or remove, dewy fog on your lens making you just that much more ready to take the pictures you want. It does its job quickly and easily and I think this is something that should be in every camera bag. I give this device a 4 plus star rating and hope that anyone considering buying a lens heater consider this one as a potential purchase.