Search  for anything...
Celestron

Celestron NexStar 90SLT Maksutov-Cassegrain Portable Telescope for Planets

Based on 248 reviews
Condition: New
Checking for the best price...
$549.99
Holiday Deal · 8% off was $599.95

Buy Now, Pay Later

As low as / mo
  • – Up to 36-month term if approved
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Zip, Apple Pay, and Google Pay. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product
This item's return window has been extended for the holiday season: FREE refund/replacement until Jan 31, 2027

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: In Stock.
Fulfilled by Amazon
Arrives Friday, Nov 13
Order within 13 hours and 6 minutes

Available payment plans shown during checkout

Protect Your Purchase

Easy claims online, fast replacements, no fees

Checking for protection plans...

Recently Viewed

At a glance

Condition
New
Style
NexStar 90 SLT
Set
Telescope Only
Dimensions
16"D x 32"W x 54"H
Weight
6.9 kg
Optical Tube Length
21 in
Focus Type
Manual Focus
Warranty
TWO-YEAR LIMITED WARRANTY
Works with
Camera, Laptop, Smartphone, Tablet

Features 6

  • Computerized Star Locating Telescope: The Celestron NexStar 90SLT is a computerized telescope that offers a database of more than 40,000 stars, galaxies, nebulae, and more. The telescope locates your object with pinpoint accuracy and tracks it
  • Compact and Portable: This telescope for adults and kids is ideal for weekend camping trips or excursions to dark sky sites. Its compact form factor makes it easy to transport and assemble just about anywhere
  • Maksutov-Cassegrain Optical Design: The NexStar 90SLT is the smallest in the SLT family. The 90mm aperture gathers enough light to see our Solar System and beyond. View Saturn's rings, Jupiter's cloud bands, and the Moon in brilliant detail
  • Fast Setup with SkyAlign: Celestron's proprietary SkyAlign procedure has you ready to observe in minutes. Simply center any three bright objects in the eyepiece and the NexStar SLT aligns to the night sky, ready to locate thousands of objects

Description

The Celestron NexStar 90SLT is a computerized telescope that offers a database of more than 40,000 stars, galaxies, nebulae, and more. The telescope locates your object with pinpoint accuracy and tracks it. At the heart of the telescope's Maksutov-Cassegrain optical design, a 90mm primary mirror gives fully color-corrected views ideal for astronomical use. The 90SLT comes with a fully computerized NexStarPlus hand control. The computerized hand control gives you the ability to automatically slew to any of its 40,000+ objects, including over 600 galaxies, 300 clusters, and dozens of beautiful binary stars. This telescope for adults and kids is ideal for weekend camping trips or excursions to dark sky sites. Its compact form factor makes it easy to transport and assemble just about anywhere. With its pre-assembled, adjustable steel tripod, the NexStar 90SLT can be up and ready to use in a matter of minutes. Our SkyAlign alignment technology and the included StarPointer Finderscope with a red LED make aligning a breeze. Simply center any three bright objects in the eyepiece and the NexStar SLT aligns to the night sky, ready to locate thousands of objects. The NexStar 90SLT Computerized GoTo Telescope also includes a free download of our Starry Night Special Edition astronomy software for an interactive sky simulation. This computerized telescope allows you to view the lunar surface, the rings around Saturn, the moons of Jupiter, and a number of the Messier objects, such as the globular cluster in Hercules (M13) or the Great Nebula in Orion (M42).

Specs 31

Brand Celestron
Model Name NexStar 90SLT Computerized Telescope
Optical Tube Length 21 inches
Eye Piece Lens Description Plossl
Objective Lens Diameter 9 centimeters
Telescope Mount Description Altazimuth Mount
Product Dimensions 16"D x 32"W x 54"H
Focus Type Manual Focus

Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Friday, Nov 13

Yes, absolutely! This item's return window has been extended for the holiday season: FREE refund/replacement until Jan 31, 2027.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • Zip Pay in 4
  • Financing through Apple Pay
  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

This is an awesome beginner Telescope!
Review Image by Derek Dailey
Review Image by Derek Dailey
Review Image by Derek Dailey
Review Image by Derek Dailey
Review Image by Derek Dailey
Review Image by Derek Dailey
Review Image by Derek Dailey
Review Image by Derek Dailey
Review Image by Derek Dailey
I have use this to view the Sun (with a Bader solar filter), Moon, Jupiter, Saturn, Albireo, Andromeda, and Pleiades. You get stunning views of the moon and sunspots are very distinguishable with this scope. Saturn is pretty small, but the rings are distinct and some moons can be spotted around Saturn. I was able to faintly see the bands of Jupiter and the Galilean moons are pretty bright. You would need a bigger telescope to get more detail from the planetary objects, but the views you get in this scope still makes anyone who looks pretty amazed at what they are viewing. I love the fact this has a computerized tripod mount. This takes the frustrations away of trying to keep an object in view as well as trying to locate something in the vast night sky. The setup take some practice, but it does get easier after a few attempts. My neighbor has an 8” Nexstar SL with the StarSense Automatic Alignment Accessory and I still usually beat him to having an aligned telescope by doing it with the built in SkyAlign method. The tracking is good as long as you have fresh batteries, but I highly recommend using an external power source because the batteries get drained in a few hours. I also recommend using an app to help locate objects. I am planning on getting the WiFi modules so I can use my phone to control the telescope. The included hand controller does take some time to learn, and the menu navigation can be clunky. You can use the free Celestron SkyPortal app for control your scope if you have the WiFi module. Once you have the telescope aligned it is pretty accurate on its tracking. One night I centered Saturn and went inside to watch TV for 2 hours and I was amazed that Saturn was still in the eyepiece when I came back out! You will want to make sure you have the tripod level, fresh batteries, the correct latitude/longitude, time, and date to help ensure your tracking is accurate. This Telescope has made me excited to get out on clear nights and discover the night sky and has also helped get me into trying astrophotography. I was able to use my Olympus E-PL5 the other night piggy backed on the telescope which helped me get a decent shot of Andromeda. I took an hour of exposures it was nice to have the tracking of the telescope available so Andromeda stayed centered in my camera. I also bought a T-Adapter so I could photograph objects using the telescope as a prime lens. My sun and moon shots came out very clear using this method. The sun and moon shots attached are not cropped, and you can see almost the entire frame is consumed by the sun or moon which give a great amount of detail. I highly recommend this telescope! If you can afford a larger telescope, then get the biggest one you can afford, but even though this is only a 3 1/2" scope it can give you some great views of the night sky. ... show more
Reviewed in the United States on September 12, 2017 by Derek Dailey
Great for the money
This was my first telescope, and after a solid 4 months I still do not regret my decision. Since then I've seen a lot of scopes to compare it with, and purchased some additional eyepieces. The original collimation still holds, and I've definitely knocked the thing around a lot bringing it up and down the stairs. I live in downtown Fort Lauderdale, Florida, and I can still see some pretty cool stuff on a night with average seeing (for down here). Planetary viewing is really good with this scope, with targets like Jupiter or Saturn really looking impressive. Deep sky objects are okay if you know what you're looking for, but the scope doesn't have a big enough aperture to pull in a lot of detail. I bought a set of 6 Orion eyepieces (way better quality than the stock Celestron ones) and it's been a very worthwhile upgrade. Getting the scope sky-aligned took a little practice, and to this day I can't get it to work perfectly. After aligning, a selected object will usually appear to one side of the field, and you need to center it out. If you're using a high magnification eyepiece you won't have a prayer of getting the object inside of the field too, but that's okay. Once you're locked on, the scope reliably tracks the target through the sky, which is really the important part. Another thing worth mentioning is that the batteries don't last long. Get the car power adapter and just plug it into one of those jump starter thingies. It'll last weeks on one of those without a problem. ... show more
Reviewed in the United States on April 14, 2014 by Seth's Bike Hacks
Very happy
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" ... show more
Reviewed in the United States on February 17, 2012 by Alonso Montoya Guzman
Good Telescope for the money
For the money, this is the perfect choice for a beginner. I wanted something simple to start astrophotography. The assembly was extremely easy. Aligning the telescope with the NexStar is a bit more difficult. The first night we tried, it was a beautiful, star-filled night--no moon. We couldn't see Venus through the telescope, and we thought perhaps the telescope itself was broken. The next day, we used the telescope in daylight and could see trees, etc, so we decided that the stars were just not bright enough the previous night for us to align the NexStar. We are going to try and align on the next full moon. I will post a follow-up to let you know if it works. The telescope itself is heavy-duty. The stand is rugged. The whole thing weighs about 30 pounds. All in all, I think this will be a great telescope, and I'm looking forward to getting the other things in so I can take some pictures. Update: I'm downgrading my rating a bit, as I've found that after several attempts to align the NexStar, it is very difficult for a beginner. I am new to astronomy and the NexStar sold me on this telescope; I love the telescope, but I'd have better luck finding the planets, etc. on my own than with this mount. It also seems to shake a bit, even on firm ground. I'm ordering the pads for the legs of the tripod to see if I can keep the vibrations to a minimum. We saw Venus this evening, and I did take some beautiful pictures of the moon this evening with the adapter for my Canon Rebel. It isn't a bad scope, but I really don't like the Nexstar thing at all. I'm hoping by the time ISON gets here I'll have a better handle on how to work it. BE SURE TO GET THE MOON FILTERS! Even with the filter, the moon was super bright! ... show more
Reviewed in the United States on November 3, 2013 by Rmcelvr
For Mak Lovers
Review Image by R.T.
Review Image by R.T.
Review Image by R.T.
Review Image by R.T.
Review Image by R.T.
Review Image by R.T.
Review Image by R.T.
Review Image by R.T.
I have a love for Maksutov-Cassegrain telescopes. Started with an 80mm x 500mm f/6.3 MTO 3M-6A. Moved up to a C90 Mak. Wanted a go-to so I traded laterally to this NexStar 90 SLT. Same 90mm x 1250mm f/13.9 as the C90. Maksutov pros: portability, planetary use, no collimation, meniscus corrector design Maksutov cons: not as "fast" and limited deep sky compared to refractors, long cooldown time 90 SLT pros: features to price ratio, easy connection for DSLR/Mirrorless with a T-Ring adapter 90 SLT cons: Sky-Align proving fussy I tried 3-star alignment on two occasions. Once from a Bortle 4 and once from a Bortle 3. Neither time would the scope "go to" Saturn after alignment. I'm sure it's operator error and I have to practice more. Went out in the field once and discovered Solar tracking not straightforward to unlock. I watched a tutorial and took notes so I'm sure the second time will be a success. (UPDATE: Solar Tracking successfully unlocked and working. YAY!) This telescope is PERFECT for APS-C cameras vs The Moon or The Sun (NEVER AIM YOUR TELESCOPE OR CAMERA AT THE SUN WITHOUT A SOLAR FILTER FOR THE PROTECTION OF YOUR EYES AND EQUIPMENT) With a level and balanced setup, Lunar tracking has been a breeze. As I said any other failures are likely on my part for planetary and solar go-to and tracking. Practice makes perfect. I'm still learning the NexStar system. I wish to expand my skills and get to Venus, Jupiter, Saturn and appropriate deep sky objects. This is a package I can definitely grow into. Attached pictures taken with the Celestron NexStar 90 SLT and a Sony a6300 APS-C Mirrorless camera. No images were stacked, these are single frame: Waxing Crescent final edit from ARW file Abstract Image final edit from ARW file (tracked the Moon and it went behind a tree - took unfocused shot to show the donut shaped bokeh of the reflex lens) 3x eyepiece projections onto a6300 sensor of Moon Details final edit from ARW file Solar image final edit from ARW file (I used a Spectrum Telescope Glass Solar Filter ST425G) (UPDATE: Solar closeup image - final edit from 12 ARW files, aligned & stacked) I also attached a chart showing how much of the sensor on APS-C is covered by the Moon. It would be the same coverage for the Sun as well. If Lunar and Solar observation/imaging is a primary focus for choosing a scope, the 90 SLT is a great choice. It is less of a "tight fit" to get the Moon or Sun onto an APS-C sensor than the 127 SLT to ensure you are imaging in the clearest part of the lens (the middle). Also, there is more weight left over to add camera/accessories onto the 90 SLT and not overburden the 8lb payload capacity of the mount vs the 127 SLT. Bonus feature for me: I plan on adding a small (perhaps 90mm x 500mm) achromatic refractor to my arsenal sometime in the future and the mount should be able to handle that well. ... show more
Reviewed in the United States on December 9, 2023 by R.T.
JUNK! JUNK! JUNK!
I hate to be the odd man out on this product but the telescope that I received is an absolute piece of junk. I had many fond childhood memories of viewing the planets with a telescope. I wanted to introduce my daughter to astronomy too so I did my research and decided on this product. Along with the power pack ( a Must!) and other accessories I spent right about $500. I should have just flushed the money down the toilet. The auto-align feature never worked. I read the instructions slowly and repeatedly over and over to try to figure out what I was doing wrong. I was doing nothing wrong. The auto align just won't function. I called customer support. They just repeated to me what was in the instructions. I tried again and again and again and again and again,,, It just won't align. so I called customer support again and was told that they would take a look at it if I sent it back. UPS told me it would cost $120 in postage for a $300 telescope that maybe Celestron could or couldn't repair. I felt that I had already wasted enough money on this thing and that I wasn't going to spend another fortune on postage with no guarantee that the issue would be resolved. But there was always moon viewing. And Jupiter. And Venus. I could always find these objects in the sky and view them with my half-functioning paper weight of telescope. Until tonight's super moon eclipse. I pulled this thing out of storage with the thought that we could use it to view the moon. But of course now the thing won't focus. You can turn the focus knob to your little heart's delight and it makes absolutely no impact on the clarity of the object you are attempting to view. This is now beyond frustrating. I am a very frugal shopper. This was a pure luxury purchase. I need this the way I need athlete's foot: I don't. And I wasted $500. This telescope was supposed to bring joy and togetherness, It was bought to introduce my daughter to the wonders of the Heavens. Instead I associate this item with frustration, regret and waste. In the end we used a $12 pair of Tesco binoculars to view the eclipse. Beautiful, crisp image. And the focus ring worked too. Caveat Empor. ... show more
Reviewed in the United States on September 28, 2015 by Leon B.
I saw Saturn so clearly!
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. ... show more
Reviewed in the United States on May 24, 2013 by Marie X
Difficult
Very difficult to calibrate.
Reviewed in the United States on August 16, 2026 by Raymond Prince
How it works
Checking for best price...