The Meade #673 Dew Shield is designed exclusively for all Meade ETX-90 Telescopes. It extends your viewing time during high humidity, acts as a shield to keep ambient light away from your primary, can be stored directly on your telescope when not in use, and attaches to the front lens cell of the Meade ETX-90 Telescopes.
Dew shields are an effective defense against the build-up of dew on your optics. At the same time they improve contrast by keeping stray light from bouncing off of the primary lens.
The Meade dew shield threads onto the front lens cell, and can be stored on the telescope when both are not in use by turning the shield around and sliding it over the tube assembly. What could be more convenient?