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

↑ "Dew Shields". skyandtelescope.com. http://www.skyandtelescope.com/astronomy-resources/dealing-with-dew/. Retrieved November 20, 2017.
↑ "Heating element". astronomics.com. https://www.astronomics.com/heated-dew-shields-lens-shades-celestron-telescopes_c393.aspx. Retrieved November 20, 2017.

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[1] "Dew Shields". skyandtelescope.com. http://www.skyandtelescope.com/astronomy-resources/dealing-with-dew/. Retrieved November 20, 2017.

[2] "Heating element". astronomics.com. https://www.astronomics.com/heated-dew-shields-lens-shades-celestron-telescopes_c393.aspx. Retrieved November 20, 2017.