Celestron NexStar 90SLT-Mak
$599.95 price checked August 2026
If you need a portable telescope for weekend camping trips, this is the one to price-check.
Where the NexStar 90SLT-Mak Fits
The Celestron NexStar 90SLT-Mak is for the budget-conscious beginner who needs a computerized system to find celestial objects, as its 90mm aperture clears the 70mm threshold for clear lunar and planetary views in this Celestron NexStar 90SLT-Mak review.
Finding specific deep-sky objects often feels impossible when you have to manually hunt for them across a vast night sky. This frustration usually stems from a lack of automated tracking, which can leave beginners staring at empty patches of space.
The Celestron NexStar 90SLT-Mak solves this by providing a computerized star locating system with a database of over 40,000 objects. Its 90mm aperture ensures you can see the solar system and moon in detail while the software handles the navigation.
We evaluated the telescope options we compared for this category to determine which models balance automation with portability. This review is for the shopper who prioritizes ease of use and automated tracking over high-resolution deep-sky imaging.
If you need a larger aperture, view our full NexStar 127SLT review for more details.
How RecommendedOptics picked: we started from the 200 most-reviewed telescope listings in our retail dataset, removed duplicates, accessories and off-category products, and 67 qualified. This product is one of 15 from that pool chosen for a full review. Our scores blend buyer satisfaction (60%), price position against comparable products (25%) and rating volume (15%). Specifications come from manufacturer listings and ratings from verified Amazon buyer reviews (data checked August 2026).
The Short Answer on the NexStar 90SLT-Mak
Best for: you need a portable, computerized telescope for viewing the Moon, planets, and bright deep-sky objects during camping trips.
The Celestron NexStar 90SLT-Mak is a strong choice at $599.95.
- Pro: The 90mm aperture clears the 70mm threshold required to resolve lunar craters and Jupiter’s moons clearly.
- Pro: The SkyAlign procedure allows you to align the telescope to the night sky in minutes using three bright objects.
- Pro: It includes a database of more than 40,000 stars, galaxies, and nebulae for automated locating.
- Con: The 90mm aperture falls short of the 100mm threshold needed to reliably show the Andromeda Galaxy.
- Con: Because it falls short of the 130mm aperture threshold, you cannot use this for high-resolution deep-sky imaging.
Don’t buy this if: you require an aperture of at least 100mm to observe the Andromeda Galaxy.
Price assessment: The $599.95 price point is fair for a computerized Maksutov-Cassegrain with a 40,000-object database.
RecommendedOptics score: 6/10 (data-driven – see “How we picked” above)
You might also consider the NexStar 8SE spec breakdown if you prefer a Schmidt-Cassegrain design.
The Specifications That Matter
| Aperture | 90mm |
| Optical Design | Maksutov-Cassegrain |
| Weight | 15.18 pounds |
| Dimensions | 40 x 19 x 11 inches |
| Database | 40,000+ stars, galaxies, nebulae, and more |
| Alignment System | SkyAlign |
The 90mm aperture clears the 70mm threshold required to resolve lunar craters and Jupiter’s moons clearly.
Performance: What the Specs Deliver
SkyAlign Setup Procedure
The SkyAlign procedure allows you to align the NexStar 90SLT-Mak to the night sky by centering three bright objects in the eyepiece. You can complete this process in minutes, which removes the primary hurdle of manual alignment when you are observing in the dark.
Maksutov-Cassegrain Optics
The 90mm aperture of the NexStar 90SLT-Mak clears the 70mm threshold required to resolve lunar craters and Jupiter’s moons clearly. While the 90mm aperture falls short of the 100mm threshold for reliably showing the Andromeda Galaxy, it provides enough light to view Saturn’s rings and Jupiter’s cloud bands in detail.
Portable Design
The NexStar 90SLT-Mak features a compact form factor designed for transport to dark sky sites or weekend camping trips. This portability allows you to move the telescope to different locations without the bulk of larger systems, though you should check the specific weight and dimensions to ensure it fits your transport vehicle.
How the NexStar 90SLT-Mak Compares to Alternatives
The NexStar 90SLT-Mak provides a computerized experience that the larger manual options in this comparison lack, allowing for automated tracking of over 40,000 objects.
- The NexStar 90SLT-Mak costs $19.96 more than the Sky-Watcher Skymax 150mm Maksutov-Cassegrain.
- The Sky-Watcher Heritage 150 Tabletop Dobsonian Telescope offers a 150mm aperture, whereas the NexStar 90SLT-Mak provides a 90mm aperture.
- The Celestron AstroMaster 130EQMD Newtonian Reflector costs $170.96 less than the NexStar 90SLT-Mak.
- The Celestron CPC 1100 StarBright XLT GPS Telescope provides an 11-inch aperture, while the NexStar 90SLT-Mak provides a 90mm aperture.
- The SVBONY SV48P Refractor Telescope is $199.96 cheaper than the NexStar 90SLT-Mak.
If you prefer maximizing light-gathering power over automated tracking, the Sky-Watcher Heritage 150 Tabletop Dobsonian Telescope is a better pick for your backyard.
For a different tracking technology, see how the StarSense Explorer DX performs.
Where This Price Sits
The Celestron NexStar 90SLT-Mak sits at a price point of $599.95, which is $137 above the $463 average for the similar telescope products we compared it against. While the 90mm aperture clears the 70mm threshold required to resolve lunar craters and Jupiter’s moons clearly, it falls short of the 100mm aperture needed to reliably show the Andromeda Galaxy. You are paying a premium for the motorized tracking and the Maksutov-Cassegrain optical design rather than a larger light-gathering surface.
The included astronomy software is a top consumer-rated program for interactive sky simulation, and the data indicates it is a free download. Because the specific user interface details are not listed in our spec breakdown, you should check the software’s system requirements and mobile compatibility on the manufacturer’s site before purchasing. The NexStar 90SLT-Mak is the right buy if you prioritize a computerized GoTo system and a portable design over the deep-sky reach of a 100mm or 130mm aperture telescope.
Where this sits in the buyer data: Among the 67 products screened for this category, this one’s 3.9 rating places it #49, on 246 ratings – above the 210-rating median of that group, so the average rests on more feedback than most of its comparables. On price it undercuts 13 of them.
The NexStar 90SLT-Mak: Remaining Questions
Is the tripod stable enough to keep the image from shaking when I’m looking at planets?
The NexStar 90SLT-Mak uses a computerized mount designed to track objects with pinpoint accuracy, which helps minimize the shake common in portable setups. Because the 90mm aperture provides a compact form factor for the SLT family, you should check the specific weight capacity of the included tripod to ensure it maintains steady high-magnification views.
Does the tube get too hot or cold to use quickly when I take it outside?
The Makutov-Cassegrain optical design of the NexStar 90SLT-Mak typically requires a period of thermal equilibrium to reach outside temperatures before providing sharp images. You should check the manufacturer’s recommended acclimation time for the 90mm tube to ensure the optics are settled before you begin your observation.
Is the Celestron NexStar 90SLT-Mak easy to set up for a beginner?
Yes, the SkyAlign procedure allows you to begin observing in minutes by centering three bright objects in the eyepiece. The NexStar 90SLT-Mak also includes a free download of consumer-rated astronomy software to help you navigate the 40,000+ objects in its internal database.
Is the Celestron NexStar 90SLT-Mak worth it for a backyard telescope?
If you are a budget-first shopper seeking to see the Solar System and the Moon in detail, the NexStar 90SLT-Mak offers a 90mm aperture for around $599.95. While it falls short of the 100mm aperture threshold required to reliably show the Andromeda Galaxy, it clears the 70mm threshold needed to resolve lunar craters and Jupiter’s moons.
Understanding your needs is easier when you learn how to choose a mount type.
Beginners can start by viewing the different types of telescopes, explained.
Is the NexStar 90SLT-Mak Right for You?
The NexStar 90SLT-Mak suits 5 kinds of buyer and is the wrong choice for 3 jobs, listed below with the reason for each.
Who the NexStar 90SLT-Mak is for, and what it does well
Who the NexStar 90SLT-Mak suits
- Parents of children interested in space — the compact and portable design makes it easy to transport for educational excursions
- Backyard stargazers with limited space — the small Maksutov-Cassegrain optical design allows for a compact footprint
- Beginner astronomers — the SkyAlign procedure and 40,000+ object database make it easy to find targets quickly
- Weekend campers — the portable form factor allows for easy transport to dark sky sites
- Students of astronomy — the included interactive sky simulation software helps visualize celestial objects
What the NexStar 90SLT-Mak handles well
- Viewing Saturn’s rings — the 90mm aperture gathers enough light for solar system detail
- Observing Jupiter’s cloud bands — the Maksutov-Cassegrain design provides clear views of planetary details
- Quickly locating deep-sky objects — the computerized star locating system with 40,000+ objects
- Mobile stargazing — the compact and portable form factor for easy transport
- Rapid night sky alignment — the proprietary SkyAlign procedure for setup in minutes
What the NexStar 90SLT-Mak is the wrong choice for
- Astrophotography of faint nebulae — the 90mm aperture is too small for high-detail deep space imaging
- Observing very dim galaxies — the 90mm aperture limits light gathering compared to larger telescopes
- Professional-grade observatory use — the compact and portable design is intended for hobbyist use rather than permanent installations
What to budget alongside the NexStar 90SLT-Mak, and what to skip
Worth buying at the same time
- Astronomy software — to utilize the included interactive sky simulation
- Extra eyepieces — to vary the magnification of the 90mm aperture
- Red-light flashlight — to navigate the controls without ruining night vision
- Sturdy tripod — to provide a stable base for the computerized mount
- Star map charts — to supplement the 40,000+ object database during observation
What you can skip
- Manual alignment tools — the SkyAlign procedure makes manual alignment unnecessary
- Basic star catalogs — the telescope already includes a database of over 40,000 objects
- Entry-level sky simulation software — the product includes a free download of a top-rated program
Browse our list of the top rated astronomy telescope for adults to see more options.
Where to Buy the NexStar 90SLT-Mak
These retailers sell Telescope generally – we do not track which of them has this particular model in stock, so check availability and the current price with the retailer before making a trip.
- Walmart (online and physical stores) — physical availability for budget-friendly starter models
- Target (online and physical stores) — convenient in-store pickup for basic beginner scopes
- B&H Photo Video (online only) — specialist photography and optics expertise
- High Point Scientific (online only) — specialist technical advice and high-end equipment
- Costco (online and physical stores) — bulk-buy options and membership-based pricing
- Amazon (online only) — wide selection of entry-level and mid-range brands
Final Verdict on the NexStar 90SLT-Mak
The NexStar 90SLT-Mak is a practical choice for this price point at approximately $599.95.
The NexStar 90SLT-Mak clears the 70mm aperture threshold required to resolve lunar craters and Jupiter’s moons clearly. It also includes a database of more than 40,000 stars, galaxies, and nebulae to assist with automated locating.
Skip it if: you need to see the Andromeda Galaxy or high-resolution deep-sky detail, as the 90mm aperture falls short of the 100mm and 130mm thresholds required for those targets.