Celestron StarSense Explorer LT App-Enabled Newtonian Reflector Telescope 114AZ Unleash the power of your smartphone to take you on a guided tour of the night sky-no telescope experience required. Award-winning and patented StarSense sky recognition technology uses your smartphone to analyze star patterns overhead and calculate its position in real time. StarSense Explorer Powered by SkySafari app automatically generates a list of objects currently visible. View planets, brighter nebulae and galaxies, star clusters, and double stars from the city. Or take your telescope to darker skies to view faint, deep sky objects. Manual altazimuth mount with altitude slow motion adjustment with a sliding rod makes it easy to follow the on-screen arrows to your desired target. When the bullseye turns green, it's ready to view in the telescope's eyepiece. 114mm (4.5ins) Newtonian reflector with highly reflective coatings and enough light gathering ability to view all the best celestial objects. Includes 25mm and 10mm eyepieces, 2x Barlow Lens, StarSense smartphone dock, a red dot finderscope (in case you want to use the telescope without your phone), and a full-height tripod. Optical Design: Newtonian Reflector | Spherical Primary Mirror Aperture: 114mm (4.5") Focal Length: 1000mm (39.3") Focal Ratio: f/9 Focal Length of Eyepiece 1: 25mm (0.98") Magnification of Eyepiece 1: 40x Focal Length of Eyepiece 2: 10mm (0.39") Magnification of Eyepiece 2: 100x Barlow Lens: 2x (1.25") Finderscope: StarPointer red dot finderscope Optical Tube: Steel Highest Useful Magnification: 269x Lowest Useful Magnification: 16x Limiting Stellar Magnitude: 12.8 Resolution (Rayleigh): 1.22 arc seconds Resolution (Dawes): 1.02 arc seconds Light Gathering Power (Compared to human eye): 265x Secondary Mirror Obstruction: 44mm (1.73") Secondary Mirror Obstruction by Diameter: 38% Secondary Mirror Obstruction by Area: 14% Optical Coatings: Glass mirrors coated with aluminum and SiO