Celestron NexStar 127SLT Review: Good Value or Not?
The 127SLT pairs genuinely sharp Maksutov optics with a computerised mount at a price that makes it one of the most popular telescopes sold, and the optics deserve the reputation. Buy it if you want the Moon and planets to look crisp from a small telescope you can carry out in one trip. Skip it if you want deep sky views, because the long focal length and modest aperture make faint objects hard work, and the supplied tripod is the weakest part of the package.
A sharp little Maksutov on a mount that is the reason to think twice.
Celestron NexStar 127SLT Maksutov-Cassegrain Computerized GoTo Telescope
~$660
A 127mm Maksutov-Cassegrain on Celestron's computerised SLT mount, with SkyAlign three star alignment and a database of over 40,000 objects.
Check price on AmazonSpecifications
| Optical design | Maksutov-Cassegrain, 127mm aperture |
|---|---|
| Mount | Computerised alt-azimuth SLT |
| Database | Over 40,000 stars, galaxies and nebulae |
| Alignment | SkyAlign, centre any three bright objects |
| Portability | Compact and light enough to move assembled |
| Software | Includes a Starry Night Special Edition download |
| Warranty | Two year US warranty per Celestron |
Specifications above come from Celestron's published specifications. Treat pricing as approximate, since Amazon pricing moves.
What it does well
- Maksutov optics at this aperture give high contrast, well corrected images that make the Moon and planets look genuinely sharp.
- The tube is tiny for its focal length, so the whole telescope stores in a cupboard and moves in one carry.
- SkyAlign removes the need to know any star by name, which is the feature that keeps beginners observing.
- It is well under half the price of the fork mounted Schmidt-Cassegrains while sharing the same control system.
Where it falls short
- The tripod is the honest weakness. It is light, and at high magnification the image shivers after every touch, which is where most of the criticism of this telescope comes from.
- A closed tube Maksutov needs time to reach ambient temperature. Views half an hour after going outside are noticeably better than views straight away.
- The narrow field of view at long focal length makes sweeping for deep sky objects difficult and unrewarding.
- Alt-azimuth tracking rules out long exposure imaging, and the mount is not intended to carry a camera load.
What owners report
Published owner reports praise the optics with near unanimity and criticise the tripod with the same consistency. The recurring advice from long term owners is to observe with the tripod legs unextended where possible, to add vibration suppression pads, and to accept a settling delay after focusing. That mix, excellent optics on an adequate mount, is the fair summary of this telescope.
The second theme is cool down. Owners repeatedly report that the telescope underperforms in the first twenty to thirty minutes outside, and that putting it out early transforms the view. That is a property of the closed tube design rather than a fault, and it is worth knowing before you judge your first night.
Who it suits
- Observers whose interest is the Moon, planets and double stars.
- People with very little storage space who still want computerised finding.
- Buyers who want to spend well under a thousand dollars on a GoTo telescope.
Who should skip it
- Deep sky observers, who need aperture and a wide field rather than long focal length.
- Anyone planning astrophotography beyond short Moon and planet clips.
- Observers who want maximum aperture for the money, who should look at a Dobsonian.
Alternatives worth considering
Sky-Watcher Skymax 127mm Maksutov-Cassegrain optical tube
~$610
The same class of optics as a bare tube with a 2 inch diagonal and finder, no mount included. The right choice if you already own a decent mount, since the tripod is what most 127SLT owners end up wishing they had spent more on.
Check price on AmazonSky-Watcher Heritage 130mm Tabletop Dobsonian Telescope
~$305
Similar aperture, a much wider field and half the price, with no electronics at all. Better on deep sky objects, worse on planets, and it needs a table or a stool to sit on.
Check price on AmazonCelestron NexStar 6SE Schmidt-Cassegrain Telescope
~$1,049
More aperture on a substantially more stable single arm fork. It costs around four hundred dollars more, and the difference in steadiness at high power is the main thing you are buying.
Check price on AmazonKeep reading
- Tabletop Dobsonian vs GoTo telescope
- Schmidt-Cassegrain vs Newtonian
- Magnification calculator
- Celestron NexStar 6SE review
- Sky-Watcher Heritage 130mm review
- Planet viewing by aperture
This review draws on published specifications, manufacturer figures and the consensus of verified owner reviews. We have not tested this product ourselves, and we say so rather than implying otherwise. As an Amazon Associate we earn from qualifying purchases.
Frequently asked questions
Is the NexStar 127SLT good for planets?
Yes. A 127mm Maksutov gives high contrast views that show Saturn's rings, Jupiter's belts and lunar detail crisply. The two practical caveats are letting the telescope cool for twenty to thirty minutes before expecting the best views, and managing the tripod's tendency to vibrate after you touch the focuser.
Is the tripod really that bad?
It is the part every long term owner mentions. It works, but it is light for the tube, so the image shivers for a second or two after any contact. Keeping the legs short, adding vibration suppression pads and using a slow focus touch all help. If that prospect annoys you, budget for a sturdier mount or step up a model.
Can the 127SLT see deep sky objects?
It will show bright clusters and the brightest nebulae and galaxies, but the long focal length gives a narrow field that makes them harder to locate and less impressive when found. For deep sky work, aperture and a wide field matter more, which is what a Dobsonian provides at the same price.
How long does the 127SLT take to cool down?
Plan on twenty to thirty minutes outside before high magnification views settle, longer on a cold night. The corrector plate and mirror have to reach ambient temperature or the air currents inside the tube blur fine detail. Putting the telescope out while you finish dinner is the usual solution.
127SLT or a tabletop Dobsonian?
The Maksutov wins on planets and on finding objects for you. The tabletop Dobsonian wins on deep sky views, on price and on having nothing to fail. Our tabletop Dobsonian versus GoTo telescope comparison sets the two approaches against each other properly.
How we choose: we compare published manufacturer specifications, optical figures we can verify, and reviews from owners who have used the equipment under real skies. We do not test gear in person. Never point any telescope, finder or binocular at the Sun without a certified full-aperture solar filter fitted over the front of the instrument.
Recording your own eyepieces, exit pupils and sessions? The Observing & Astrophotography Planner is the paid version of these pages: 8 printable worksheets you fill in with your own numbers, plus the full PDF, $29.