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  Accessory: Astronomy: Accessory - DEWCAPS
Posted on Monday, November 29 @ 01:13:14 CST by astronomy
 
 
  Accessory

DEWCAPS

When exposed to the cool night air, the front lens of a refractor or Schmidt-Cassegrain can readily attract dew or frost.

One remedy is a dewcap—a tube extending in front of the telescope. Dewcaps come with most refractors, but they must be bought separately for Schmidt-Cassegrain telescopes. Dewcaps are fine for light dew. On very humid or frosty nights, however, a
heater coil that wraps around the telescope tube is much more effective. Heater coils are also available for eyepieces and finderscopes.

 
 
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