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
edit- ^ "Dew Shields". skyandtelescope.com. Retrieved November 20, 2017.
- ^ "Heating element". astronomics.com. Retrieved November 20, 2017.
 | This camera-related article is a stub. You can help Wikipedia by expanding it. |