Use the Astroscan without light pollution from streetlights, neighboring houses, and even daylight.
Help prevent condensation from forming on the optical window of your Astroscan as it’s exposed to the night air. Especially important on humid or very cold nights, this cap extension is also designed to keep stray light from entering the telescope.
This extension is designed to be used in conjunction with the Astroscan cap (pictured above but not included).