Celestron Nexstar 90 SLT Maksutov Cassegrain Telescope 1

Celestron Nexstar 90 SLT Maksutov Cassegrain 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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Celestron Nexstar 90 SLT Maksutov-Cassegrain Telescope

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 SLT’s 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 GoTo’s 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!

Stock No: 22087


  • 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
  • Good for terrestrial and celestial observing
  • Includes CD-ROM & “The Sky” Astronomy Software which provides education about the sky and printable sky maps
Computerized Mount Features
  • 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


  • OPTICAL DESIGN: Maksutov-Cassegrain
  • WEIGHT: 12 lb (5.44 kg)
  • APERTURE: 90 mm (3.54 in)
  • FOCAL LENGTH: 1250 mm (49.21 in)
  • FOCAL RATIO: 13.89
  • FINDERSCOPE: StarPointer
  • MOUNT: Motorized Altazimuth
  • EYEPIECE 1: 25 mm (0.98 in)
  • EYEPIECE 2: 9 mm (0.35 in)
  • MAGNIFICATION 2: 139 x
  • ACCESSORY TRAY: No Tool, Quick release
  • TRIPOD: Steel
  • CD ROM: The Sky Level 1 and NexStar Observers List (v2.6.4c)
  • RESOLUTION (RAYLEIGH): 1.55 arcsec
  • RESOLUTION (DAWES): 1.29 arcsec
  • LINEAR FIELD OF VIEW (@1000 yds): 53 ft (16.15 m)
  • OPTICAL COATINGS: Fully-Coated Computer
  • HAND CONTROL: Fully Computerized / Flash Upgradeable
  • SLEW SPEEDS: Nine slew speeds: 4°/sec, 2°/sec, 1°/sec, .5°/sec, 32x, 16x, 8x, 4x, 2x
  • 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
  • DATABASE: 4,000 Object Database
  • GPS: Optional CN-16 GPS Accessory


NexStar SLT Series MAKs Manual


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