Easy to operate / Fully computer-guided / 80mm (3.1") lens aperture / 800mm focal length / f/10 focal ratio / 1.25" Super Plössl Eyepieces (9.7mm, 26mm) The Meade DS-2000 models are easy to operate but sophisticated, fully computer-guided GO TO telescopes. All models share the Meade lightweight, portable and reliable DS-2000 single arm robotic mount with Model 494 Autostar Computer Keypad. This incredible technology knows the night sky right out of the box. Turn it on, and after a brief alignment procedure, your telescope is ready to take you to any object in its over 14,000-object library or take you on a guided tour of the heavens. See more objects in one night than Galileo saw in a lifetime. The Meade DS-2000 models are easy to operate but sophisticated, fully computer-guided GO TO telescopes. The Meade DS-2080AT-TC Altazimuth Refractor features a Lens Aperture of 80mm (3.1") with a focal length of 800mm and focal ratio f/10. This complete package includes the Meade DS-2000 single arm mount with #494 AutoStar computerized keypad with over 1400 object library Database and automatic tracking and GOTO, AutoStar Suite Astronomer Edition Software and Instructional DVD, two high quality Meade Series 4000 1.25" Super Plössl Eyepieces (9.7mm, 26mm) and Red Dot Viewfinder. # The solidly built metal construction mount features advanced electronics to make alignment easy, including an internal clock. The adjustable height aluminum tripod allows comfortable viewing from either a seated or standing position. Optional image erecting prism may be used (not included) for terrestrial viewing where a non-inverted (upright and correct left to right image) is desired. Aperture 80mm (3.1") # Focal Length 800mm # Focal Ratio f/10 # Mount GO TO Altazimuth DS-2000 Mount # Optical Design Refractor