Astrozap Dew Heater Bands
Astrozap Dew Heater Straps apply heat evenly across their length and are made with advanced materials right here in the USA. The telescope side is made with material that does not mar or scratch the telescope's finish. An adjustable velco attachment permits a snug fit for efficient application of just enough heat to keep the objective above the dew point when used appropriately with a Dew Heater Controller.
The term "dew heater" is somewhat unfortunate because you don't want either them or your telescope to get hot. The goal is to keep your optics at a temperature just slightly above the dew point so that condensation cannot occur. When operated correctly these heater bands will only be slightly warm to the touch. These heater bands should never be used without a dew heater controller as they will get too warm and introduce convection currents within your optical tube. The effect of these tube currents is the same as bad seeing conditions, meaning that magnification will be limited and it will be diffocult or imopossible to achieve a crisp focus.