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  • Celestron NexStar 90SLT Mak Computerized Telescope (Black)
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Celestron NexStar 90SLT Mak Computerized Telescope (Black)

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List Price: $419.95
Price: $341.08 & FREE Shipping. Details
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  • High quality 90mm (3.5") Maksutov-Cassegrain
  • Quick-release fork arm mount, optical tube and accessory tray for quick tool no set up
  • StarPointer finderscope to help with alignment and accurately locating objects
  • Good for terrestrial and celestial observing
  • Includes "The SkyX" Planetarium software
11 new from $339.95 1 used from $317.20
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Frequently Bought Together

Celestron NexStar 90SLT Mak Computerized Telescope (Black) + Celestron 18778 AC Adapter (Black) + Celestron Accessory Kit
Price for all three: $486.57

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Technical Details

  • Brand Name: Celestron
  • Model: NexStar 90SLT Mak

Product Details

  • Product Dimensions: 40 x 19 x 11 inches ; 20 pounds
  • Shipping Weight: 25.4 pounds (View shipping rates and policies)
  • Shipping: Currently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues.
  • ASIN: B0038LX8WU
  • Item model number: NexStar 90SLT Mak
  • Average Customer Review: 4.3 out of 5 stars  See all reviews (27 customer reviews)
  • Amazon Best Sellers Rank: #1,886 in Camera & Photo (See Top 100 in Camera & Photo)
  • Date first available at Amazon.com: November 1, 2003

Product Description

Product Description

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.


Celestron's NexStar 90 SLT is the most compact telescope in Celestron's computerized NexStar line, with excellent Maksutov-Cassegrain optics that deliver delightful views of the Moon and planets. The NexStar 90 SLT package includes everything but the batteries. With a fully illustrated quick set-up guide, no tools are needed to assemble the telescope with its steel tripod, motorized mount, and computer hand control. Two eyepieces are included, a 25mm for 50X magnification and a 9mm eyepiece for 139X. The package even includes the latest version of "The Sky X", software that turns your PC into a virtual planetarium.

The Maksutov optical design of the NexStar 90 SLT gives the telescope a focal length of 1250mm in an optical tube only twelve inches long. This long focal length is ideal for bringing out detail on the Moon and planets. When I look at the Moon for example, the view is crisp and clear with no trace of false color. When I look at Saturn I can easily push the magnification to 200X with an optional 6mm plossl eyepiece. When I look at deep space objects I often like to use an optional 32mm plossl eyepiece (39X magnification) because objects like M45 the Pleiades cluster and M31 the Andromeda galaxy look better with a wider field of view.

The NexStar 90 SLT also features Celestron's patented SkyAlign technology. With SkyAlign I don't need a star chart or a compass to align the telescope, I just enter the date and time then point the telescope at three bright stars. SkyAlign tells me the star names, and allows the telescope to find over 4,000 stars, planets, and galaxies by just pushing a button. The accurate tracking makes it easy to get high power views of the planets, and allowed me to take some great pictures using a Celestron NexImage webcam. I also like the "Two-Star align" and "Solar System align" modes because I can often get the NexStar system up and running while older scopes are still waiting for their alignment stars to appear in he twilight.

I enjoy using the NexStar 90SLT because it has excellent optics in a compact, twelve pound package that I can carry outside in one trip and be ready to go in minutes. A computerized telescope may take practice to set up; if I don't enter the time correctly the alignment may fail for example. The other drawback of a computerized telescope, of course, is the short life of standard AA batteries. A rechargeable 12-Volt battery is a handy way to power the NexStar 90SLT, and I like to keep the tripod legs short and observe while seated because this gives me a solid and comfortable view. --Jeff Phillips


  • Excellent optics
  • Compact and portable
  • Easy computerized go-to tracking
  • "The Sky X" planetarium software included
  • Short battery life with AA batteries

Suggested Options:

Quarter Moon shot at 50X with a Powershot camera

Quarter Moon closeup shot at 200X with Neximage camera

Crater Ptolemaeus shot at 400x with Neximage and 2x barlow

Planet Mars shot at 400x with Neximage and 2x barlow

Planet Saturn shot at 400x with Neximage and 2x barlow

Customer Reviews

This is a great beginner+ telescope!
Patrick M. Coy
Planetary viewing is really good with this scope, with targets like Jupiter or Saturn really looking impressive.
Seth A.
The setup is simple and quality is great.

Most Helpful Customer Reviews

37 of 39 people found the following review helpful By SeaDog EMC on April 16, 2012
Verified Purchase
Great shipping. Fast! There was an issue with the handpiece, Celestron Customer Support was very responsive and we flashed with new software while on the phone. They're sending the Nextstar PLUS out with these. Very nice. DO NOT FORGET TO get the serial cable and the USB cord. You want to be able to plug this into your computer.

Here we are a while later, and all this thing has done is made me want more, more, more...rofl. The scope is great! I would get the dampeners, and the power supply. One of the best scopes in this price range, but now I'm looking in the $1000 plus range. Gee, "Thanks Celestron"...."you got me hooked" :P Oh and yes, you will be "so mad" when the weather does not cooperate.
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59 of 68 people found the following review helpful By Alonso Montoya Guzman on February 17, 2012
Verified Purchase
I bought this for my wife, as a birthday gift, because she always wanted a telescope and never had one before.
It's really difficult to find out what telescope buy, so many reviews over the internet and very different opinions on brands and types. After some research, I take the decision on this one.
We received it about a week ago, and we have really enjoyed these past days looking at the stars.
I will try to describe step by step our experience:
1. The assembly was very easy, no tools needed and this process take us about 10 minutes, and it can be quicker, because we take time to review everything twice, as neither of us has experience with telescopes.
2. We bring the telescope to our backyard (just about 5-6 meters away from home, basically, because we just wanted to tasted and because we were using an Ac adapter to power the telescope.
3. Aligning was not an easy task to us, the "skyalign" process it self is very simple to follow up, but we have some difficulties centering the stars in the finder scope and in the eyepiece (due to our un-experience).
4. However, about 30 minutes later, we were able to look and some stars, constellations (sadly not the moon as we have to go to bed a little earlier that we expect because of a long work day)

We're steal learning how to use it, how to get the better focus on the objects, to be able to see their "better look". However, for someone who haven't previous experience with this, the telescope is very friendly and easy to use, and the fact that you can just watch to an object looking on a catalog is very nice and simple.

One of my hobbies is photography, so, I'm expecting my T-ring/adapter to try on some pics.

I'll be updating this review as the time passes and have more to say. Until now, we are very happy with our new "toy"
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16 of 19 people found the following review helpful By Marie X on May 24, 2013
Verified Purchase
My husband who has had scoping experience very easily set this telescope up and I was able to view Saturn for the first time...wow, I am going to have fun with this. I bought the filter accessories along with it. After seeing that it takes eight double A batteries, I decided to buy the power pack because then I don't have to worry about the motor running out of juice. A solar filter for a Four inch fit was ordered afterwards too. I looked at the full moon tonight with the orange-colored filter and saw all the craters and mountains super clearly. It is also small enough to sit on my unused treadmill when not in use, ready to grab and go. The only problem was that my husband decided to take the cradle for the hand control off to move to another leg of the tripod and the plastic broke. It is now taped to the leg and I will try and replace it. Best buy for such a nice telescope....and I am a true beginner knowing nothing about them. My more experienced husband says it is a fantastic scope for this price. Click and buy one to see Comet ISON this September!
P.S. I emailed Celestron about the cradle and they sent a new one immediately! Awesome customer service...this company is on my "good guys" list. I will buy from them again and again.
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13 of 17 people found the following review helpful By Ben Hakala on May 25, 2012
Verified Purchase
Top notch. I am really happy with it. Now if I could only get the weather to cooperate so I could use it more.
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20 of 28 people found the following review helpful By Fleahead on August 17, 2012
Verified Purchase
I was a complete newbie at astronomy, and as a gadget freek, I couldn't pass this up when I started looking into telescopes. Although I did a lot reading about what type of telescope a beginner should start off with, I ignored the advice and went with this one. Almost all the articles recommend starting off with at least a 6" aperture, and preferably a Dobsonian, but I was intreged by the electronics and gadgetry of the Nexstar 4 SE.

Having used this for several months now, I'd say the quality of the 4SE is very good, and it does perform as advertised. I did have a heck of a time getting hang of the auto alignment process for the goto function, but if you take time to precisely align the objects, it works pretty good. One thing to consider would be to get the external power supply, because it eats up the 8 AA batteries pretty fast. I am using rechargeable batteries, but its a pain changing them out every few evenings.

I was amazed when I first looked at Jupitor and was able the identify it's moons. I was really blown away the first time I saw the rings on Saturn, but due to the small aperture, not much detail. I did buy the lens accessory kit, but any eyepiece over 17mm is pretty much useless with this aperture. It all comes down to how much light gets to the eyepiece, and 4" is minimal.

I'll try to sell this unit and get an Orion 8" Dobsonian
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