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Celestron NexStar 90 SLT Computerized Maksutov-Cassegrain Telescope

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- High quality 90mm Maksutov-Cassegrain
- Night sky viewing made easy with fully computerized Altazimuth mount
- Database of 4,000+ night sky objects
- Focus on sky objects quickly with the StarPointer finderscope
- Quick and painless set up with Quick-release fork arm mount
- Sturdy stainless steel tripod
- Convenient accessory tray included
- Includes "The Sky" Software (Night Sky education)
SKU: CEL-22087
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Retail Price $1,100.00


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Created to be an excellent entry-level telescope into the exciting frontier of astronomy, the Celestron NexStar 90 SLT Computerized Refractor Telescope comes pre-built with many exciting features. With pre-assembled, adjustable stainless steel tripods, and quick-release fork arms and tubes, this NexStar SLT telescope can be set up in a matter of minutes - no dramas at all!

Cleverly Created
Powered by 8 AA user-supplied batteries, an optional AC adapter, optional car-battery adapter, or powertank power source, the NexStar GOTO would suit any nomad. The internal battery compartment provides power to the high-precision servo motors for rigid low-vibration performance - while simultaneously eliminating annoying cord wrap issues associated with external battery packs.

The NexStar's comes with an ergonomically engineered hand controller, allowing the user to remove the hand control from its holder for remote use or leave it cradled for hands-free operation. At the touch of a button, you can select an object from the object catalog, change the slew speed, view fascinating information about an object, or simply find out whether your desired object is visible in your skies.

The SkyAlign Revolution by Celestrong
Using Celestron's patented SkyAlign, simply input the date, time, and location into the hand control then slew the telescope to any three bright celestial objects in the sky. Voila and that's it - alignment so easy it's hard to believe! You'll finally be able to spend your evening observing the night sky instead of aligning your telescope!

NexStar 90SLT General Features
- High quality 90mm Maksutov-Cassegrain
- Night sky viewing made easy with fully computerized Altazimuth mount
- Database of 4,000+ night sky objects
- Focus on sky objects quickly with the StarPointer finderscope
- Quick and painless set up with Quick-release fork arm mount
- Sturdy stainless steel tripod
- Convenient accessory tray included
- Includes "The Sky" Software (Night Sky education)

NexStar 90SLT - 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


Additional Info

Optical Design Maksutov-Cassegrain
Weight 12 lb (5.44 kg)
Aperture 90 mm (4.49 in)
Focal Length 1250 mm (49.21 in)
Focal Ratio
Eyepiece 1 25 mm (0.98 in)
Magnification 1 50 x
Eyepiece 2 9 mm (0.35 in)
Magnification 2 135 x
Finderscope StarPointer
Mount Motorized Altazimuth
Star Diagonal 1.25
Accessory Tray No Tool, Quick release
Tripod Steel
CD ROM "The Sky®" Level 1 and NexStar Observers List (v2.6.4c))
Highest Useful Magnification 213x
Limiting Stellar Magnitude 12.3
Resolution (Rayleigh) 1.55 arcsec
Resolution (Dawes) 1.29 arcsec
Light Gathering Power 165 x
Angular Field of View
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: 3°/sec, 2°/sec, 1°/sec,
1°/sec, 64x, 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
Manufacturer Celestron
Recommended Usage Astrophotography, Viewing Galaxies/Stars, Viewing Nebulae, Viewing the Moon, Viewing the Planets
User Level No



Celestron Limited Warranty

Celestron warrants its products to be free from defects in materials and workmanship for the length of time specified by this product to the original owner. Each product will list the warranty for it on our website.

Celestron will repair or replace the product which, upon inspection by Celestron, is found to be defective in materials or workmanship and within the definitions of the limits described below.

This warranty is effective January 1, 2012, and supersedes all other warranties as noted in brochures, instruction manuals, product packaging, etc.

This warranty does not cover products that have been subject to abuse, misuse, physically damaged, altered, or had unauthorized repairs or modifications. This warranty does not cover defects due to normal wear and tear and other conditions.

Celestron shall use reasonable efforts to repair or replace any binocular or spotting scope covered by this warranty within thirty calendar days of receipt. If it takes longer, the customer will be notified.

If warranty problems arise, or if you need assistance in using your product, please contact our Customer Service.


I have done my research with the celestron nexstar 90 slt. my question is, even though its limited stellar magnitude is 12, will I be able to get decent views of the planets and deep sky objects such as the plieades, orion nebula and Andromeda galaxy?
The Celestron NexStar 90 SLT Computerized Maksutov-Cassegrain Telescope has more than enough power for viewing the planets and more popular celestial objects. You may encounter some challenges when you try to pinpoint the fainter deep space objects. Bear in mind that an object with a lower magnitude is brighter and more visible than objects with a large magnitude. The sun is even rated at a negative magnitude because of its brightness. So a stellar magnitude viewing capacity of 12 still leaves you with plenty of objects to view.
To power the Celestron Nexstar 4 SE from your vehicle do you only require the cigarette lighter adapter cord or do you also require the battery pack?
To power the telescope from your car, you only need the Celestron Car Battery Adapter (for all NexStars) which can be found on our website here: http://www.ozscopes.com.au/celestron-car-battery-adapter-for-all-nexstars.html
If I get a telescope for astrophotography, using t-adapters to replace eyepieces, what magnification would I have ? Also, can you use filters with photography ?
If you use the Universal T-adapter (http://www.ozscopes.com.au/celestron-t-adapter-universal-1-25-in.html) which replaces the eyepieces, it'll be equivalent to a 25mm lens / eyepiece, so the magnification will just be the (focal length of the telescope that you're using) divided by the 25mm . This is just an estimate, as it depends on the sensor of the camera that you're using it with. You can also use a Variable eyepiece projection camera adapter (http://www.ozscopes.com.au/camera-adapter-variable-eyepiece-projection-saxon-ca003-1-25-inch.html) which allows you to put in different eyepieces into it while you're using it for astrophotography. With this camera adapter the magnification would be the (focal length of the telescope) divided by the (focal length of the eyepiece). And yes you can use filters with photography. The moon filters and colour filters go between the eyepiece / t-adapter and the telescope eyepiece barrel, so it'll fit with any t-adapters you may use.
can I use NiMH rechargeable batteries in this scope? willI lose all my initial settings if I remove the batteries for charging? how long can I expect the batteries to last on normal use for 2 hr.per night?
There are no problems using NiMH batteries with your telescope. The scope itself stores no settings internally, and initial settings will need to be confirmed each time the scope is started up, so this won't be a problem. The mount does chew through batteries quite quick though, so you may expect to achieve 5-6 hours usage with rechargeable batteries.
Is this nextstar90 suitable for a rainforest area with high humidity? Can I manually override the auto movement? Is 5.44kg with the tripod?
This is a fully sealed, airtight scope so moisture will not be able to get into the tube. Yes you can manually override the auto movement. The control can be used to manually move the scope up, down, left and right. Total weight of the scope with the tripod is 5.44kg.

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