Reduced price! Celestron Nexstar 102 SLT View larger

Celestron Nexstar 102 SLT

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Choose To Extend Your warranty for only £49.00

Rechargeable power supplies are cheaper to use & a more reliable source of power. AA rechargeables can not be used but you can use alkaline or lithium - but are more expensive over time

A lens hood will shield stray light & dew fall

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Data sheet

Optical Design Refractor
Aperture 4 inch
Mount Type AZ Go-To
Focal Length 660 mm
Focal Ratio F6.5
Finderscope StarPointer
Optical Coatings Multi Coated
What is more important to you? Image resolution over brightness
Would you like a telescope to navigate for you? Yes, I would like a scope to guide me.
Is this product normally on display at Grovers? Yes - But Check First If Making A Special Journey!

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The popularity of our previous short tube refractor models inspired us to go a step further with the introduction of our NexStar 102 SLT. You'll find that astronomical viewing is a delight with this large, powerful 4" telescop

The 102 SLT offers a 63% increase in image brightness over 80mm models. This short-tube telescope with a fast f/5 optical system gives images that are bright and crisp. 

And the 102 SLT, like the other models in the SLT Series, comes with a fully computerized hand control with a database of over 4,000 celestial objects! With its pre-assembled, adjustable steel tripod, the NexStar 102 SLT can be up and ready to use in a matter of minutes. Our new SkyAlign alignment technology and the included StarPointer Finderscope with a red LED makes aligning a breeze.
Because of its wide 1.7 ° field of view, the NexStar 102 SLT is optimal for scanning large areas of the sky and for superb terrestrial (land) viewing. A wonderful entry to mid-level astronomical scope, with the use of an optional erect image diagonal, the 102 SLT can also be used as a land-based spotting telescope.

The key advantages of the SLT Series over similar looking telescopes:

  • Compatible with Celestron’s StarSense AutoAlign for completely automatic set-up on the night sky

  • Advanced NEXSTAR + handset

  • Internal battery compartment - no external corded battery pack

  • SkyQ Wi-Fi link compatible

  • SkyAlign - the simplest, fastest & most beginner friendly alignment method available on any computerised telescope.

  • Four additional alignments including 1 star align and solar system align

  • Auxiliary port for additional accessories (GPS module, SkyQ Wi-Fi link)

  • PC control software INCLUDED (NSOL disc)

  • Sky Maps CD-ROM INCLUDED (The Sky disc)

  • GPS module compatible (quick and easy set-up)

  • User friendly StarPointer red-dot finderscope

  • Compatible with Celestron’s NexRemote for advanced PC control


  • Compatible with 2" eyepieces

  • High quality 102mm short tube style refractor

  • 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

  • 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 SkySync GPS Accessory (93969) 

  • 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

WEIGHT: 14 lb (6.35 kg)
APERTURE: 102 mm (4.02 in)
FOCAL LENGTH: 660 mm (25.98 in)
MOUNT: Motorized Altazimuth 
EYEPIECE 1: 25 mm (0.98 in)
EYEPIECE 2: 9 mm (0.35 in)
ACCESSORY TRAY: No Tool, Quick release 
TRIPOD: Steel 
CD ROM: The Sky Level 1 & NexStar Observers List (v2.6.4c) 
RESOLUTION: 1.36 arc seconds
RESOLVING POWER: 1.14 arc seconds
LINEAR FIELD OF VIEW (@1000 YDS): 91 ft (27.74 m)
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 & EQ South 
ALIGNMENT PROCEDURES: SkyAlign, Auto 2-Star Align, 1-Star Align, 2-Star Align, SolarSymtem Align 
DATABASE: 4,000 Object Database 
GPS: Optional CN-16 GPS Accessory

Our view

The SLT to choose for those pinpoint star images and wide-field star clouds. The102 is a short focal ratio achromatic refractor, and thus ideal for low to medium power views of deep-sky objects. Because of the refracting objective and short focal ratio, this telescope performs at its best showing the brighter deep-sky objects in good contrast against the background sky. It makes an ideal telescope for an introduction to visual astronomy. It can also be used successfully as a white light solar telescope by adding Baader Astrosolar film over the full aperture.
Requirements. You will need a 12v Powertank or a 230v AC to 12v DC adapter power supply. This will need to be tip positive and regulated. The SLT mounts are designed to work from AA alkaline batteries, but because of the amp draw during full slew of the motors, they may only last for one nights observing, such is the nature of small batteries, particularly in temperatures close to zero.


Budget for a power supply, a weak light pollution filter such as the Baader 1.25” Neodymium filter, an A4 sheet of Baader Astrosolar, a single 1.25” Baader polarizing filter and a wide-angle eyepiece (something with a wider apparent field than about 60 degrees).







Wifi Icon 177X123  

Celestron’s telescopes reach a new level with integrated WiFi! Leave your hand control behind and slew to all the best celestial objects with a tap of your smart device. Connect your device to your WiFi telescope’s built-in wireless network and explore the universe with Celestron’s SkyPortal mobile app for iOS and Android.

Or upgrade your compatible Celestron computerized telescope with the SkyPortal WiFi module. SkyPortal provides full wireless control of your telescope and turns your smart device into your own personal planetarium and observatory!





Skyportal Icon 177X123   Celestron’s newest planetarium app is an astronomy suite that redefines how you experience the night sky. Explore the Solar System, 120,000 stars, over 200 star clusters, nebulae, galaxies, and dozens of asteroids, comets, and satellites—including the ISS. SkyPortal includes everything you need to experience the night sky in an exciting new way.






Starsense 177X123    


With Celestron’s patented StarSense Technology, telescope alignment has never been easier! Just attach the StarSense AutoAlign accessory, push the Align button on the hand control or smart device, and StarSense begins capturing and comparing images of the night sky against its internal database.

In about three minutes, it’s gathered enough information to triangulate its position and align itself. Then, press the Sky Tour button: StarSense will automatically slew to all the best stars, planets, galaxies, and more currently visible in the night sky.

 PDF Specification sheet for filters and dew straps

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