Dew shield

A dew shield is a device used to prevent moisture or condensation buildup on the lens of a camera or telescope collector during night observations.[1] The dew shield either shades the lens or provides a small amount of warm air directly in front of the lens or collector to prevent dew from collecting on the element. Some dew shields work by using a heating element that keeps the objective lens warm enough to keep the dew from collecting.[2]

References
  1. "Dew Shields". skyandtelescope.com. Retrieved November 20, 2017.
  2. "Heating element". astronomics.com. Retrieved November 20, 2017.
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