40 mm eyepiece included (51x) Celestron C8-A XLT Telescope for Advanced VX - 91020-XLT EdgeHD Optical Tube Celestron C14 XLT Optical Tube Assembly | First Light Optics 8 Inch EdgeHD Optical Tube Each tube has been fitted with a removable secondary mirror and is opto-mechanically aligned on a laser bench to ensure they are axially symmetric in any configuration. All Celestron EDGE HD telescopes are fitted with the larger CGE (Losmandy-type) dovetail 2032 mm focal length (f/10) The EdgeHD 8 Optical Tube Assembly from Celestron features an Aplanatic Schmidt-Cassegrain optical system. This compound, or catadioptric, light-path employs a combination of mirrors and lenses that offer a large high-resolution aperture, a shorter tube length, and enhanced portability Celestron's premium StarBright XLT coatings
