The Celestron NexStar 90SLT telescope has been a customer favourite for years thanks to its unique combination of high-quality optics, a user-friendly computerised interface, and a sturdy single fork arm mount. This telescope comes with a pre-assembled, adjustable stainless-steel tripod, quick release fork arm, NexStar+ computerized hand control, 90mm Maksutov-Cassegrain optical tube, and lots of bonus accessories. The entire telescope kit is a simple, no-tool assembly and fast SkyAlign alignment procedure will have you ready to observe in minutes. This makes NexStar 90SLT your perfect companion for impromptu observing sessions and all-night stargazing marathons alike. Your NexStar 90SLT will reveal details of the lunar surface, Venus and its phases, the polar caps on Mars, Jupiter and its four moons, and Saturn with its rings plainly visible. It can also be used as a land-based spotting telescope for daytime and wildlife observations. Computerised 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 computerised 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 – The proprietary SkyAlign alignment procedure makes setting up and using a computerised 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. Power – Go anywhere. Feel free to enjoy your NexStar SLT in remote dark sky locations. It is 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). Your telescope includes a StarPointer red dot finderscope, a star diagonal, and two eyepieces (25mm and 9mm). The two eyepieces offer different magnifications for low or high-powered observing. The star diagonal provides a right-side-up view and a more comfortable viewing angle when looking up at the sky. The StarPointer red dot finderscope will help you quickly center an object in your eyepiece for easier observing. NexStar 90SLT is ready to grow with you as you become a more experienced amateur astronomer. It is compatible with all Celestron's latest accessories, including StarSense AutoAlign, SkyPortal WiFi module, and PowerTank Lithium. Your purchase includes a FREE download of Celestron's Starry Night. This powerful software will help you learn about the night sky, celestial objects, and how to plan your next observing session. Celestron Starry Night is the premier astronomy software package on the market, providing resources and knowledge to view our solar system and beyond. Features - High quality 90mm Maksutov-Cassegrain - Fully computerized Altazimuth mount - StarPointer finderscope to help with alignment and accurately locating objects - Quick-release fork arm mount, optical tube and accessory tray for quick no tool set up - Sturdy stainless steel tripod and accessory tray included - Perfect for terrestrial and celestial observing - BONUS Starry Night Special Edition Astronomy Software download with a 36,000-object database, printable sky maps and enhanced images including 3D renderings of stars, exoplanets, and galaxies Specifications Optical Design Maksutov-Cassegrain Aperture 90mm Focal Length 1250mm Focal Ratio f/14 Focal Length of Eyepiece 1 25mm Magnification of Eyepiece 1 50x Focal Length of Eyepiece 2 9mm Magnification of Eyepiece 2 139x Finderscope StarPointer red dot finderscope Star Diagonal 1.25 Highest Useful Magnification 213x Lowest Useful Magnification 13x Limiting Stellar Magnitude 12.3 Resolution (Rayleigh) 1.55 arc seconds Resolution (Dawes) 1.29 arc seconds Light Gathering Power (Compared to human eye) 165x Apparent Field of View 1 deg Linear Field of View (@1000 yds) 53 ft (16 m) Optical Coatings Fully-Coated Mount Type Motorized Altazimuth Accessory Tray No Tool, Quick release Tripod Steel Slew Speeds Nine slew speeds Tracking Rates Sidereal, Solar and Lunar Tracking Modes Alt-Az, EQ North and EQ South Alignment Procedures SkyAlign, Auto 2-Star Align, 1-Star Align, 2-Star Align, Solar System Align Computer Hand Control Fully Computerised / Flash Upgradeable NexStar+ Database 40,000 Object Database GPS Optional SkySync GPS Accessory (93969) Software Starry Night Special Edition