Overview
I’ve had the Celestron StarSense Explorer DX 130AZ for about a year now, so I thought I’d share my thoughts on this telescope, my experiences using it both at home and at public star parties, and a few drawbacks that potential buyers should know about so there are no surprises.
Let me start with my 30,000-foot take. It’s a good little scope that’s beginner-friendly, portable, and easy and fun to use. While it does have some flaws, which I’ll get into shortly, I think it works very well as an entry-level telescope for those new to the hobby and looking to explore the night sky.
Design and Features
The Explorer DX 130AZ is a 5-inch Newtonian reflector mounted on an alt-azimuth mount and enhanced by a smartphone-guided system. It uses Celestron’s proprietary StarSense Explorer app on your smart phone, which allows you to easily locate objects in the night sky. That feature alone is what makes this telescope especially appealing and accessible to both newcomers and seasoned amateurs.
Using the StarSense Explorer App
When I take this scope into the backyard, I can effortlessly locate and observe a dozen objects in just a few minutes. Whether I’m using the app’s Tonight’s Best list or browsing nearby targets in the sky atlas and hopping from one object to the next, the process is quick and intuitive. It’s funny, I just navigated to the App Store and Google Play because I was interested in seeing what users were saying and how they are rating this app. I found the ratings for the StarSense Explorer app to be all over the map at both places. It appears people either love it or hate it. My experience with the app, for what it’s worth, is that it was easy to install, activate and calibrate with the scope. I’ve found it to be user friendly, and have had zero issues with it. Here’s a short (one minute) video from Celestron showing you how the app works with the telescope, and just how easy it is to use.
Finding objects in the night sky is simple once you’ve installed the app, docked your phone to the telescope, and calibrated the app so it aligns with what you see through the eyepiece. That may sound like a lot, but it’s actually very straightforward, especially after you’ve done it once or twice. The app provides an easy-to-follow, step-by-step setup routine that you use each time you observe.
It’s important to note that this telescope does not track objects on its own. This is not a fully automated system that finds and tracks objects for you. The app simply guides you very precisely to the target. You are the one pushing the telescope to the object and manually tracking it once found.
Ease of Use and Public Outreach
After setting up the telescope and docking a phone, I showed my 15-year-old son how to locate an object and gave him a few pointers. This took about a minute. I then turned him loose with it at a star party while I manned another telescope nearby. He took to the setup immediately, showing multiple objects to party-goers.
I was genuinely amazed at how easily he was able to use the telescope and find targets, especially considering it was the first telescope he had ever used on his own. He even used the object descriptions in the app to explain to people what they were seeing through the eyepiece. He had a blast and now frequently asks when the next star party is happening.
Optical Performance
Under dark skies, the telescope provides surprisingly good views of the Moon, planets, and deep-sky objects. It accepts both standard 1.25-inch and 2-inch eyepieces using the supplied adapter. I’ve found that high-quality wide-angle or ultra-wide 2-inch eyepieces really enhance the experience, but the included 25mm and 10mm Kellner-type eyepieces are adequate for getting started.
The scope also comes with a red-dot finder, which can be useful if your phone battery dies and you cannot use the app. Personally, I only find it helpful during initial setup and calibration. Once the app is aligned, I turn the finder off and rely entirely on StarSense. It is worth mentioning that you do not have to use a phone or the app to operate this telescope. You can use the red-dot finder and star-hop manually if you prefer.
Mount and Stability Issues
The tripod itself has adjustable, sturdy legs and works well. The alt-azimuth mount, however, is another story. It uses a single-arm design that simply is not rigid enough to fully support the optical tube. This results in vibrations when focusing or repositioning the telescope. While the vibrations do settle fairly quickly, observing in even a moderate breeze can become frustrating due to shaking in the eyepiece.
The second mount issue is more significant. There is a dead spot when observing objects overhead. This is a common limitation of alt-az mounts, particularly single-arm designs. The optical tube cannot point straight up because it hits the tripod. As a result, there is a circular area near the zenith that is temporarily unreachable. If an object you want to observe is high in the sky, you will have to wait until it moves past this dead zone.
Focuser and Slow Motion Controls
Some users have reported focuser issues, either being too loose and causing image shift or too tight and making fine focus difficult. I have not experienced either problem with my unit. My focuser is smooth and works well.
The slow motion controls, however, are another matter. These flexible rods are intended to allow precise movements while minimizing vibrations, but on my mount they simply do not work very well. I have found them to be more trouble than they are worth. Instead, I usually move the telescope manually just using my hands while watching the app or the eyepiece, and that works well enough.
Overall Verdict
Despite its flaws, I genuinely believe this telescope works well as an entry-level option. Especially at this price point, the StarSense app makes finding objects easy and approachable for beginners. It removes guesswork, reduces frustration, and allows users to focus on observing rather than hunting. I truly wish this technology had existed when I was learning the night sky.
There are comparable telescopes in this price range, but none offer the StarSense system. In my opinion, that makes a significant difference.
Alternatives and Pricing
Celestron also offers a 6-inch StarSense Explorer Dobsonian, but it is a tabletop design, which I’m personally not fond of primarily because you are always going to have to find or provide something to set the scope on. They do offer an 8-inch StarSense Explorer Dobsonian, which I do recommend, though it is nearly twice the price of the DX 130AZ. If your budget allows, the 8-inch model is the better long-term choice.
The Celestron StarSense Explorer DX 130AZ retails for $499. As I recall I purchased mine on sale. These scopes do go on sale occasionally, so it is worth keeping an eye out. If you are in the market for one check the Celestron web site and various large online outlets for the best price you can find.
Buying Used
Facebook Marketplace can also be a good place to look. I see this model listed from time to time in great condition for less than the sale price I paid for mine. If buying used, be sure to inspect the telescope in person. Check the mirrors, the mount, and the phone dock. If anything is missing or damaged, walk away.
Also be sure to ask for the StarSense Explorer app activation code. It was supplied to the seller in the scope’s original box. You will need it to unlock the app. If the code is missing, Celestron support may still be able to help. If everything checks out, you might just score a great deal. Below you’ll find the DX 130AZ’s specifications and image gallery. Click on any image below to go to the gallery for a better view.
Celestron StarSense Explorer DX 130AZ Specifications
- Optical Design: 130 mm (5.1″) Newtonian reflector
- Focal Length: 650 mm (25.6″); focal ratio f/5
- Resolution: Rayleigh 1.07″, Dawes 0.89″
- Limiting Magnitude: 13.1
- Magnification (with included eyepieces):
‑ 25 mm → 26×
‑ 10 mm → 65× - Highest Useful Magnification: ~307×; Lowest ~19×
- Finderscope: StarPointer red‑dot (reflex sight)
- Optical Coatings: Aluminum + SiO₂ with high reflectivity
- Mount type: Manual Alt‑Azimuth with dual-axis slow‑motion controls
- Tripod: Full‑size adjustable aluminum, includes accessory tray; max height ~49″ (1,244 mm)Weight: About 18 lb (8.2 kg) total; OTA ~8.8 lb (4 kg), tripod ~9.2 lb (4.2 kg)
