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Celestron Nexstar SLT 90MAK Telescope


Designed to be an affordable entry level to mid-level computerized GoTo telescope, the NexStar SLT refractors, reflectors, and Maks are available in the most popular sizes and are loaded with valuable design features.

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SKU: C/22087 Categories: ,


Designed to be an affordable entry level to mid-level computerized GoTo telescope, the Celestron Nexstar SLT 90MAK comes with a preassembled, adjustable stainless steel tripod and a quick release fork arm and tube. The Celestron NexStar SLT 90MAK telescope can be set up in a matter of minutes – with no tools required! You can see details of the lunar surface, Venus and its phases, polar caps on Mars, Jupiter and its four moons, Saturn with its rings plainly visible and much more! Most NexStar SLTs can also be used as a land-based spotting telescope.

Intelligent Design

Powered by 8 AA (user supplied) batteries or an optional AC adapter (#18778), these NexStar GoTos love to travel. 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.

With the NexStar’s ergonomically designed hand control, the user is free to remove the hand control from its holder for remote use or leave it cradled for hands-free operation. With a touch of a button, you can select the object catalog, change the slew speed, view fascinating information about an object or simply know if a desired object is visible in the sky.

Celestron’s Revolutionary SkyAlign

Using Celestron’s patented SkyAlign (patent pending), simply input the date, time and location into the hand control then slew the telescope to any three bright celestial objects in the sky. You do not need to know the names of the stars – you can even pick the Moon or bright planets!


  • Proven NexStar computer control technology
  • Database allows telescope to locate over 4,000 celestial objects
  • SkyAlign allows you to align on any three bright celestial objects, making for a fast and easy alignment process
  • Flash upgradeable hand control software and motor control units for downloading product updates over the Internet
  • Internal battery compartment to prevent cord wrap during use
  • Auxiliary port for additional accessories such as GPS accessory
  • Includes NSOL telescope control software for basic control of your telescope via computer (with optional RS-232 cable)
  • Compatible with optional NexRemote telescope control software, for advanced control of your telescope via computer


  • Accessory Tray: No Tool, Quick release
  • Alignment Procedures: SkyAlign, Auto 2-Star Align, 1-Star Align, 2-Star Align, Solar System Align
  • Aperture (mm): 90 mm (3.54 in)
  • Apparent Field of View: 1 “
  • Computer Hand Control: Fully Computerized / Flash Upgradeable
  • Database: 4,000 Object Database
  • Finderscope: StarPointer
  • Focal Length: 1250 mm (49 in)
  • Focal Length of Eyepiece 1: 25 mm (0.98 in)
  • Focal Length of Eyepiece 2: 9 mm (0.35 in)
  • Focal Ratio: 14
  • GPS: Optional SkySync GPS Accessory (93969)
  • Highest Useful Magnification: 213 x
  • Light Gathering Power: 165 x
  • Limiting Stellar Magnitude: 12.3
  • Linear Field of View: 53 ft (16 m)
  • Lowest Useful Magnification: 13 x
  • Magnification of Eyepiece 1: 50 x
  • Magnification of Eyepiece 2: 139 x
  • Mount Type: Motorized Altazimuth
  • Optical Coatings: Fully-Coated
  • Optical Design: Maksutov-Cassegrain
  • Resolution (Dawes): 1.29 arc seconds
  • Resolution (Rayleigh): 1.55 arc seconds
  • Slew Speeds: Nine slew speeds
  • Star Diagonal: 1.25
  • Tracking Modes: Alt-Az, EQ North and EQ South
  • Tracking Rates: Sidereal, Solar and Lunar
  • Tripod: Steel
  • Warranty: 2-year Telescope Warranty


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