William Optics STC Astro Duo-Narrowband Filter - 48 mm - YF-STC-ADN Celestron 6 Truss-Tube Dobsonian is their

6 Truss-Tube Dobsonian is their largest aperture telescope

Raises your Telrad Finderscope by 4"

The deep red illumination can be adjusted to just the right brightness

Interior: Foam

Connect your device to NexStar Evolution's built-in wireless network and explore the universe with the Celestron mobile app for iOS and Android

William Optics STC Astro Duo-Narrowband Filter - 48 mm - YF-STC-ADN Celestron 6 Truss-Tube Dobsonian is theirWilliam Optics STC Astro Duo Narrowband Filter 48 mm TC Astro Duo Narrowband Filter from William Optics 48 mm Size Clip Filter Dual Band type Light pollution type filter Enhances H alpha and Oxygen III wavelengths Professional Ion Beam assisted deposition and AR coating technology This is a William Optics STC Astro Duo Narrowband Filter 48 mm size. STC Astro Duo Narrowband filter can reduce the interference from artificial lighting (man made light