Lens Warmer,Lens Heater,Lens Heating defogging and dehumidification, 3 Gear Regulator Temperature USB Universal Dew Heater Strip for Telescope Camera

comme je disais fonctionne bien je l'ai donné un cadeau mais je n'ai pas pu essayer la durabilité du produit

alright, this is used for 2 inch eye pieces on a telescope and my canon lenses. For anyone who has used the telescopes at night, or done photography in cold weather, you know that foggy or misty lense.......drives you to drink!! This will be a bit big for the smaller eye pieces, but the 2 incher's are just fine. For 90% of standard lenses you will be good also. For me, the usb power supply meshes very well with the adapter I have that turns my Dewalt 20v batteries, into power sources for these warmers. And they work!!! If they can handle the Michigan Winters, they should be able to handle most of what can be thrown at them. Power draw is moderate, allowing me to power 2 of these, from a 5h battery, for several nights, viewing 3-5 hours per night. For me, this is a no-brainer

The 3 settings are great when running on batteries, you can use as little power as needed to increase battery life.

Unfortunately I was forced to buy a usb to 5.5x2.1mm connector.I don't believe this is the fault of the dew heater and more the fault of my mount.

Would stay on for 7 mins and turn off; then, wouldn't turn on again until much later, next day. Happened 2 nights in a row .