Lens Warmer with Cold Flexible Cable Down to -25, Dew Heater Preventing Lens from Fogging and Condensation for Astrophotography, Lens Heater Compatible with Telescopes and Camera in 4.26" Diameter

Excellent used it for first time last night on camera lens when the dew built up on tripod my lens kept free from fogging up.On high setting takes around a minute to get hot then set to medium which worked perfectly to keep lens clear,even stops dew build up on lens body & camera body very pleased.😀

This is a well made and cheap solution to lens misting. I use my one on my camera lens, but the band is long enough to fit a much larger lens. I use a powerbank to power it up and out of over an hour's use, it only used 11% with the lens remaining mist free for the whole session. Really happy with it.

Great heater for my camera lens 3 heat settings recommended

Took an age to arrive and after 3 uses it’s now in the bin.

I use the MSM on my astrophotography lenses, mainly 20mm and 14mm at the moment. Nights in coastal Nova Scotia can get damp, misty, chilly and almost impossible to deal with, when it comes to fogged-up lenses. I was constantly wiping mine with a lens cloth but that left droplets and streaks. Enter the MSM Lens Warmer! It is truly a game-changer. No more cloudy-looking images. I connected mine to a small 20W battery charger, the kind you can use with a cellphone. Inexpensive and lasted all night with charge left in it. So this is a very portable system and has a long USB cord as well. You can set the heater High-Middle-Low and I use Middle for my lenses. Maybe in midwinter I'd go to High but our climate is fairly mild. Nova Scotia is a foggy province, more than a snowy one! At a High setting, I might have experienced somewhat shorter battery life but it's hard to say. Highly recommend.

Purchased a right product for my astrophotography kit. But took long time to get delivery.

I use these as lens heaters for astrophotography in Alabama. (Extreme humidity...without heater, lens fogs either immediately or within minutes in the summer time.). Usually works well at low or medium setting. I used "high" last night (85% humidity) and the entire camera was warm in the am. Lens fogged after being brought outside from air conditioning but the heater 'defogged' it within 30 minutes. Powered all night with a 20W battery pack with juice still left in the am. USB plug in very convenient. Solidly built and works great.

Using this lens warmer for astrophotography directly on the lens removed the dew issue for me. Easy to set-up and use with a small battery pack of the proper amp rating. I use this with a small camera tracking mount and was well pleased with the ease of use. The three heat settings help as it allows me to tailor the heat to the evening. It's also big enough to use with my 80mm refractor if needed, so a two for one.

Like other reviewers I found that this warmer struggles in colder weather. I also found it to be a bit stiff. As a result, when I wrap it around the lens I don't get 100% contact with the lens. There always seems to be 1 or 2 bends or stiff spots that create a gap between the heating strap and the lens itself. On several occasions I've ruined my meticulously set manual focus just trying to secure the strap securely and flat to the lens. This is particularly important on really cold nights since the heater does struggle in the colder temps.