The Astrozap Dew Shield is an essential telescope accessory for anyone operating a telescope where d * The Astrozap 8" Astro-Tech/GSO RC Dew Shield fits 8" Astro-Tech/ GSO RC Telescopes. * Astrozap 8" Astro-Tech/GSO RC Dew Shield is constructed of high quality ABS-grade polymers. * Astrozap 8" Astro-Tech/GSO Rc Dew Shield reduces dew buildup on your 8" Astro-Tech/GSO RC telescope