Aperture: 80mm(3.1-Inch). Focal Length: 400mm. Focal Ratio: f/5. Internal Flip-in Barlow lens, #494 AutoStar handbox with over 1400 object library, Field Tripod, AutoStar Suite Astronomer Edition Software and Instructional DVD, Series 4000 Super Plössl Eyepieces (9.7mm, 26mm).Meade’s 80mm diameter ETX delivers excellent light gathering for increased image brightness and greater detail. Moon craters by the hundreds; cloud belts on Jupiter, and Saturn’s rings are just the beginning of what can be seen with this telescope. Meade’s brainy AutoStar® computer solves the stargazer’s two biggest challenges in navigating the heavens with a computer telescope: aligning the telescope with the night sky and finding celestial phenomenon in the vast starry firmament. Right out of the box with a simple initialization, AutoStar makes finding the sky’s elusive jewels virtually as easy as pushing a few buttons. Observe land targets or over 1400 sky objects in stunning high resolution, and learn about the sky with AutoStar"s extensive descriptions of astronomical objects displayed on its screen. FEATURES AutoStar Computer Controller Automatically guides your telescope to over 1400 objects in the night sky, all at the push of a button. Large 80mm Objective Lens Delivers crisp, bright images and greater detail. Internal Time Chip Set-up is now quicker and easier. Time and date are now precisely calibrated at our factory.