Celestron NexStar 90 SLT, 90mm (3.5") Maksutov-Cassegrain Telescope with Motorized Altazimuth Mount & 4,000+ Object Database


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About Celestron NexStar 90 SLT

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. With preassembled, adjustable stainless steel tripods, and quick release fork arms and tubes, NexStar SLT telescopes 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 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!

Celestron NexStar 90 SLT Features

  • Proven NexStar computer control technology
  • High quality 90mm Maksutov-Cassegrain
  • Database allows telescope to locate over 4,000 celestial objects
  • Fully computerized Altazimuth mount
  • SkyAlign allows you to align on any three bright celestial objects, making for a fast and easy alignment process
  • StarPointer finderscope to help with alignment and accurately locating objects
  • Quick-release fork arm mount, optical tube and accessory tray for quick no toolset up
  • Flash upgradeable hand control software and motor control units for downloading product updates over the Internet
  • Sturdy stainless steel tripod and accessory tray included
  • Internal battery compartment to prevent cord wrap during use
  • Good for terrestrial and celestial observing
  • Auxiliary port for additional accessories such as GPS accessory
  • Includes CD-ROM "The Sky"; Astronomy Software which provides educationa bout the sky and printable sky maps
  • 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

Celestron NexStar 90 SLT Specifications

Optical Design
Aperture (mm)
90 mm (3.54 in)
Focal Length
1250 mm (49 in)
Focal Ratio
Focal Length of Eyepiece 1 (mm)
25 mm (0.98 in)
Magnification of Eyepiece 1
50 x
Focal Length of Eyepiece 2 (mm)
9 mm (0.35 in)
Magnification of Eyepiece 2
139 x
Star Diagonal
Mount Type
Motorized Altazimuth
Accessory Tray
No Tool, Quick release
Highest Useful Magnification
213 x
Lowest Useful Magnification
13 x
Limiting Stellar Magnitude
Resolution (Rayleigh)
1.55 arc seconds
Resolution (Dawes)
1.29 arc seconds
Light Gathering Power
165 x
Apparent Field of View
1 Degree
Linear Field of View (@1000 yds)
53 ft (16 m)
Optical Coatings
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 Computerized / Flash Upgradeable
4,000 Object Database
Optional SkySync GPS Accessory (93969)
2-year Telescope Warranty

Celestron NexStar 90 SLT Reviews

Reviewed by 1 customers

(3 of 3 customers found this review helpful)


OMG! I can see Jupiters moons!


from Ellenwood,Ga  -  Avid Adventurer

I found the scope simple to setup and simple to align and stayed in alignment pretty well. The optics seem to be of good quality for the price and the goto feature is just wonderful. The focus knob is too close to the main eyepiece causing a more unstable image as my finger bumps into into the diagonal after a 1/4 turn. A glow in the dark bubble mount would have been a nice touch as well.


Questions & Answers Powered by TurnTo®

Questions about this item:

Shopper  is this telescope good for looking at galaxies and nebula? even below 12 magnitude?
DAVID M  For deep sky (galaxies and nebulae), you can see a little with this, but the 5Se would be better, because it has a lower F ratio. In other words, a little bit brighter image for lower power, which is what you need.
Shopper  I noticed the highest magnification of this telescope is 213x. if I were to use a 6mm eyepiece with a 2x barlow to look at Jupiter or Saturn, would the image be blurry? even if I use filters?
MAXIM F  Im sorry i cant help with this one. It was a gift and im an astronomical novice.
Shopper  I did my research on this telescope. its focal length is 14 which I know will not be great for deep sky objects. however, the limited stellar magnitude it can see up to is a magnitude of 12. I am quite confused... is this good for deep sky object observation yes or no? :/
TOM S  I'm no expert, but I don't think this telescope has a wide enough aperture to do any serious deep sky looking. It's not as wide as the 4.5" newtonian I used to have. That said, it's a great telescope. I'm very happy with it. I mainly use it to look at the planets and some of the basic objects, like the andromeda galaxy, orion nebula, etc. If I weren't in a city, I'd probably be able to see quite a bit more. But it's no light bucket, so if you're primarily looking for a deep-deep sky scope that's gonna pick up a ton of galaxies or something, you probably gotta go quite a bit bigger. The computerized mount sometimes takes a few tries to align, but once you're set up it works like a charm.
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