NEEWER USB Lens Heater, 12"/300mm Lens Warmer for DSLR Camera and Telescope, 3 Temperature Regulator Settings, Dew Heater Strip Prevents Dew, Fog & Condensation for Telescope Camera Astrophotography

温度もしっかり上がるし、巻きやすく使い勝手は良いです。

A simple item, keeps lens warm to avoid dew/condensation problems. Good Things: -Sort of elastic-y, seems to fit 50mm to bigger lens (see picture) -Will run all night on a large USB power brick, did not try with a small one -Has 3 power settings Where I live, cold is 35F, so I did not try it in the snow or where 'cold' is colder than that. Before using this I did have problems with lens condensation in situations where the camera/lens were outdoors overnight. This fixed that problem. Low worked for me (~40F) overnight. I did not try other settings. Did not use with 'star tracker'. Cannot speak to that, but I doubt that there would be problems. Bad Things: -None that I can think of

funciona perfecto, me encanto.

I really like the elastic velcro attachment. I means I can get a nice secure fit a round the telescope.

Perfecto cumple su cometido todo ok