Article · Wikipedia archive · Last revised May 27, 2026

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. 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.

Last revised
May 27, 2026
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Wikipedia ↗

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

References

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