AstroZap Flexible Dew Shield for 6" Celestron SE w/notch

Designed specifically for the Celestron 6" SE, the Astrozap  #AZ-116  DEW SHIELD creates a zone of air that does not cool as rapidly as the air surrounding the telescope thereby significantly reducing the formation of dew.

Additionally, dew shields serve a bonus function of reducing or eliminating stray, off-axis light from entering the optical tube, thereby increasing the contrast of the object's appearance in the eyepiece or the image the camera acquires.

Simply put, DEW is water vapor in the air condensing on astronomical viewing and imaging equipment, particularly optical glass.  There is a Solution: ASTROZAP manufactures three different methods to manage dew control and prevention: Passive, Active, and Passive/Active.

A telescope will begin losing heat to the atmosphere almost as soon as the sun sets. As the air cools, the optical glass begins to cool as well but faster than the drop in air temperature. Once the temperature of the optics reaches the DEW POINT (the temperature at which the relative humidity reaches 100%), water condenses on the glass surfaces as....DEW!

Refractors, Schmidt-Cassegrains and Maksutov-Cassegrains are particularly susceptible to dew formation owing to their design, which places glass at the front end of the optical tube.

The mainstay of the passive group is the DEW SHIELD. The "classic” dew shield consists of a cylinder of material, usually made of metal or plastic, placed on the front of a refractor, Schmidt-Cassegrain, Schmidt-Newtonian, Maksutov-Cassegrain, or Maksutov-Newtonian telescope.

Features:

• High quality design fashioned from durable, black ABS plastic.
• The AstroZap Flexible Dew Shield is felt lined to absorb moisture and block stray light.
• Sewn-in velcro strips for fast wrap around and rubber trim to prevent slippage.
• Rolls up, or lays flat for easy storage.
• This AstroZap Flexible Dew Shield is designed specifically for 6" Celestron Schmidt Cassegrain Telescopes