On a humid evening, the front glass of a small telescope can quickly become foggy. This Astrozap dewband for a 4-inch telescope, approximately 102 mm, keeps the glass warmer than the outside air, so dew has no chance to form.
You place the band around the tube, just behind the front lens or corrector plate. It is intended for a 4-inch refractor or Maksutov, such as the Skymax-102 Maksutov. Connected to a dew regulator, you can determine how much heat it emits.
Do not set the regulator higher than necessary, because too much heat creates air turbulence for the opening. If you also use a dew cap, That way, the band doesn't have to work as hard and your battery lasts longer.
For a telescope of 127 mm there is the band for 5 inch telescopes.
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