COOWOO Lens Heater Warmer 450mm Dew Heater 5V USB with 3 Gear Temperature Controller Heater Strip for Outdoor Photography Astronomy Telescope Camera Lens Heating Milk Warmer Keep from Fog Dew Freeze…

Saves having to clean the lens of dew when doing night photography. Works very well, but you do need a power-bank to keep it going. I use a small flat energizer power-bank, about half the size of a smart phone.

Perfect for telescope anti-condensation heater duty. Nice power control feature too. Very neat and very good value. Needed to daisy-chain two heaters together (very easy to do using the velcro fasteners attached) to reach all the way around my 9 1/4" SCT. Fitted perfectly.

This works well and keeps my lens dew and frost free. The switch stopped working fairly quickly but as it was easily removable, I just use it without the switch. It still does exactly what I want.I didn't bother to send the switch back so I might just have a bad one.

My wife is a very keen photographer and has had several photos published. This lens heater has proved massively useful in stopping her lenses from fogging up in various locations, indoors and outdoors. She now says she wants another one as a spare. She can buy that one herself.

Product works very well, and is nonetheless unexpensive. I used it on my telescopes for astro imaging.Just works...have 2 of them now.

Great product. Here’s hoping for clear skies

Easy to use, and works perfectly highly recommend!

I purchased two of these in March & November 2020 as dew heaters for my imaging and guiding telescopes. I took them off to adjust their position and found that both of them were burnt. The pictures are of the worst of the two but the second one was going in the same direction. They have been returned to Amazon. They are a potential fire hazard