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I'm selling this telescope as I don't use it anymore. It's been used nicely and one can still observe the night sky nicely with it.The Mount & TechnologiesComputerized AltAzimuth Mount — The NexStar SLT telescope features a single fork arm altazimuth mount, which allows the telescope to track the desired objects as they appear to move across the night sky. The mount sits on a pre-assembled, adjustable steel tripod. NexStar+ Hand Control — This computerized hand control enables you to automatically slew to any of 40,000 celestial objects with the push of a button. The NexStar+ database includes more than 600 galaxies, 300 clusters and dozens of beautiful binary stars. Not sure what to observe? Choose the Sky Tour feature and the NexStar+ hand control will automatically generate a list of all the best celestial objects currently visible based on your exact time and location. SkyAlign Technology — Our proprietary SkyAlign alignment procedure makes setting up and using a computerized telescope faster and easier than ever before. Point the telescope at three bright objects in the sky, and the telescope can triangulate its position and locate any other object in the sky automatically. You don't need to know the names of the stars—you can even pick the Moon or bright planets! For more information about our SkyAlign technology, visit here. Power— Go anywhere! Feel free to enjoy your NexStar SLT in remote dark sky locations—it's powered by 8 AA batteries (not included) or a PowerTank portable battery (sold separately). The internal battery compartment provides power to the high precision servo motors for rigid low-vibration performance while eliminating cord wrap issues associated with external battery packs. You may also power your telescope with a 12V AC adapter (sold separately). Optical Tube Info: Optical Design:Newtonian Reflector Aperture:130mm (5.12") Focal Length:650mm (26") Focal Ratio:f/5 Focal Length of Eyepiece 1:25mm (0.98") Magnification of Eyepiece 1:26x Focal Length of Eyepiece 2:9mm (0.35") Magnification of Eyepiece 2:72x Finderscope:StarPointer™ red dot finderscope Star Diagonal:N/A Optical Tube:Aluminum Highest Useful Magnification:307x Lowest Useful Magnification:19x Limiting Stellar Magnitude:13.1 Resolution (Rayleigh):1.07 arc seconds Resolution (Dawes):0.89 arc seconds Light Gathering Power (Compared to human eye):345x Secondary Mirror Obstruction:43mm (1.7") Secondary Mirror Obstruction by Diameter:33% Secondary Mirror Obstruction by Area:11% Optical Coatings:Aluminum Optical Tube Length:635mm (25") Optical Tube Diameter:165.1mm (6.5") Optical Tube Weight:8.8 lbs (3.99 kg)