NexStar 130SLT computerized starter telescope review

When it comes to choosing a telescope to start with, it can be a daunting task with so many options available. That's where the Celestron NexStar 130 SLT comes in. It's a 130mm (5.12-inch) Newtonian reflector telescope that's been grabbing the attention of amateur astronomers. It's got a bigger aperture and a computerized GOTO mount, making it an excellent choice for new stargazers. At around $500, it's a steal and won't break the bank, but it still packs a punch with all its advanced features.

Diving in: The Celestron Nexstar 130SLT review

At its core, the NexStar 130 SLT boasts a 130mm aperture with a focal length of 650mm, resulting in a focal ratio of f/5. This "fast" focal ratio is advantageous for observing faint deep-sky objects such as nebulae and galaxies, as it allows more light to be gathered over a shorter period. The telescope utilizes a parabolic primary mirror, which aids in reducing optical aberrations and delivering sharper images.

The telescope comes equipped with two Plössl eyepieces: a 25mm eyepiece providing 26x magnification and a 9mm eyepiece offering 72x magnification. These eyepieces are suitable for a range of observations, from wide-field views of star clusters to more detailed examinations of lunar craters. However, users might consider investing in additional eyepieces or a Barlow lens to expand the range of magnifications available.

The NexStar 130 SLT features a computerized alt-azimuth mount, controlled via the NexStar+ hand controller. This system houses a database of over 4,000 celestial objects, allowing users to select an object, after which the telescope automatically slews to the target and tracks it across the sky. This functionality is particularly beneficial for beginners who may not yet be familiar with star-hopping techniques.

The telescope employs Celestron's SkyAlign technology for alignment. This process involves pointing the telescope at any three bright objects in the sky, which the system then uses to calculate its orientation. While this method is designed for ease of use, some users have reported mixed success, with alignment occasionally failing. In such cases, reverting to a conventional two-star alignment, which requires identifying and centering two known stars, often yields better results.

The NexStar 130 SLT is designed with portability in mind. The optical tube is made from aluminum, contributing to its lightweight nature, and the entire setup weighs approximately 18 pounds. This makes it relatively easy to transport to different observation sites. The steel tripod, which comes pre-assembled, provides a stable base, though some users have noted that it could be more robust, especially when the telescope is used at higher magnifications.

In practical use, the NexStar 130 SLT offers commendable views of a variety of celestial objects. Users have reported satisfactory observations of planets like Jupiter and Saturn, as well as deep-sky objects such as the Andromeda Galaxy (M31) and the Orion Nebula (M42). The telescope's ability to gather ample light, combined with its computerized tracking, enhances the overall stargazing experience. ​

However, some challenges have been noted. The mount, while functional, can be prone to vibrations, which may affect image stability, particularly during focusing. Additionally, the focuser has been described as somewhat stiff, requiring careful handling to achieve precise focus. These issues, though not deal-breakers, may require users to exercise patience and develop a gentle touch during observations. ​

For those considering the NexStar 130 SLT, it's important to weigh its features against potential limitations. The computerized mount offers significant convenience, especially for novices, by simplifying the process of locating and tracking celestial objects. However, this convenience comes with a learning curve, as users must become familiar with the alignment procedures and hand controller operations. Moreover, the reliance on power sources means that investing in a reliable external power supply, such as a portable power tank, is advisable to ensure uninterrupted sessions.

Another aspect to consider is maintenance. As a Newtonian reflector, the NexStar 130 SLT requires periodic collimation to ensure optimal optical performance. While this process is straightforward with practice, beginners should be prepared to learn and perform this essential maintenance task. ​

While the NexStar 130 SLT offers a blend of aperture and technology, some users might explore alternatives based on their specific interests. For instance, those who prioritize manual operation and simplicity might consider a 6-inch Dobsonian reflector. Dobsonian telescopes are known for their ease of use, sturdy mounts, and excellent value in terms of aperture per dollar. However, they lack the computerized features of the NexStar series, requiring users to locate objects manually. ​

The Celestron NexStar 130 SLT stands as a compelling option for beginners seeking a telescope that combines a respectable aperture with the convenience of computerized tracking. Its ability to introduce users to a wide array of celestial objects, coupled with its portability, makes it a popular choice in its price range. Prospective buyers should be mindful of its quirks, such as the mount's stability and the necessity for regular collimation, and weigh these factors against the benefits of its automated features. With realistic expectations and a willingness to engage with its learning curve, the NexStar 130 SLT can serve as a valuable tool in the exploration of the night sky.

Celestron NexStar SLT130 specifications

• Optical Design: Newtonian Reflector
• Aperture: 130mm (5.12")
• Focal Length: 650mm (26")
• Focal Ratio: f/5
• Eyepiece 1: 25mm (0.98") → Magnification: 26x
• Eyepiece 2: 9mm (0.35") → Magnification: 72x
• Finderscope: StarPointer™ red dot finderscope
• Star Diagonal: N/A
• Optical Tube Material: Aluminum
• Magnification Range: Highest Useful Magnification: 307x
• Magnification Range: Lowest Useful Magnification: 19x
• Limiting Stellar Magnitude: 13.1
• Resolution: Rayleigh Criterion: 1.07 arc seconds
• Resolution: Dawes Limit: 0.89 arc seconds
• Light Gathering Power (Compared to human eye): 345x
• Secondary Mirror: Obstruction: 43mm (1.7")
• Secondary Mirror: Obstruction by Diameter: 33%
• Secondary Mirror: Obstruction by Area: 11%
• Optical Coatings: Aluminum
• Optical Tube Dimensions & Weight: Length: 635mm (25") Diameter: 165.1mm (6.5") Weight: 8.8 lbs (3.99 kg)
• Dovetail Type: CG-5 Dovetail bar
   

Mount specifications

• Mount Type: Computerized Altitude-Azimuth Single Fork Arm
• Instrument Load Capacity: 8 lbs (3.6 kg)
• Height Adjustment Range (with Mount & Tripod): 762mm - 1270mm (30" - 50")
• Tripod Leg Diameter: 31.75mm (1.25") Stainless Steel
• Mount Head Weight: 5 lbs (2.3kg)
• Tripod Weight: 5 lbs (2.3kg)
• Accessory Tray: Yes
   

Tracking and alignment specifications

• Slew Speeds: 9 speeds, max speed 3°/second
• Tracking Rates: Sidereal, Solar, and Lunar
• Tracking Modes: Alt-Az, EQ North, and EQ South
• Alignment Procedures: SkyAlign, Auto 2-Star Align, 1-Star Align, 2-Star Align, Solar System Align
• Periodic Error Correction: No
   

Computer and electronics specifications

• GPS: N/A
• Dovetail Compatibility: CG-5 saddle plate
• Number of Auxiliary Ports: 1x AUX Port, 1x Hand Control Port (can use either port)
• Autoguide Port: No
• USB Port: Yes (Input on Hand Control)
• Power Requirements: 12 VDC - 8xAA Batteries (not included)
• Motor Drive: DC Servo Motor
• Computerized Hand Control: NexStar+ Hand Controller
• Database: Over 40,000 objects, including 220 of the best deep sky and solar system objects
• Software: Celestron Starry Night Special Edition Software & SkyPortal App
   

Included items

• Optical Tube
• Single Fork Arm Mount & Tripod
• Accessory Tray
• NexStar+ Hand Control
• 20mm and 9mm Eyepieces
• StarPointer Red Dot Finderscope
• Star Diagonal
   

Solar warning

• Never look directly at the Sun with the naked eye or through an optic without a proper solar filter, permanent eye damage may result.
• Do not project an image of the Sun through the telescope, as internal heat buildup can cause damage.
• Always supervise children when using the telescope to ensure safe operation.
   

Review of the Celestron NexStar SLT130 - A popular choice of beginners at the $500 price point

Ed Ting’s review of the Celestron NexStar SLT130

Ed Ting’s review of the Celestron NexStar SLT130 provides an in-depth look at this computerized 130mm Newtonian reflector telescope, a model that sits at a crucial price point for beginners in the $500 range. He begins by explaining that Celestron produces telescopes of varying quality, ranging from department-store-grade models he does not recommend to professional-grade instruments used in observatories. The SLT series, including the 130 model, falls in between, and he cautiously recommends it with reservations.

The 130 SLT features a 130mm (5-inch) primary mirror and a focal length of 650mm, resulting in an f/5 focal ratio. This design allows for a relatively wide field of view and bright deep-sky observations, making it appealing to beginners. One of its most attractive features is its computerized go-to system, which can automatically find and track celestial objects once aligned properly. However, Ed notes that while this technology is designed to make stargazing easier, it ironically tends to create difficulties for beginners. The alignment process can be confusing, with multiple options presented in the hand controller, many of which beginners may not understand. He finds that the SkyAlign function, which allows users to select any three bright objects in the sky, has mixed success. In his tests, about half the time, the alignment failed. Ultimately, he finds the conventional two-star alignment method more reliable, but this requires some prior knowledge of bright stars.

Another issue Ed points out is that many beginners who buy computerized telescopes assume they won’t need to learn the night sky. However, in order for the system to work properly, users must still understand some celestial navigation. This creates a paradox where beginners either need to invest time learning the night sky or spend time troubleshooting and learning the telescope’s operating system. Either way, a learning curve exists.

When it comes to the mount, Ed expresses concern about its stability. He finds it to be a weak point in the overall design, stating that it is slightly undersized for the optical tube. As a result, the telescope shakes noticeably, particularly when focusing, which can make it difficult to achieve sharp images. Many of the beginners who tested the telescope with him also commented on the shakiness. Additionally, the telescope lacks mounting rings, which means the tube cannot be rotated, a minor but notable inconvenience.

The focuser also presents some issues. Unlike many cheap focusers that tend to be too loose, the one on the SLT130 is too tight. Despite loosening all available screws, he still found it difficult to turn smoothly. This stiffness, combined with the instability of the mount, makes fine focusing challenging. The plastic knobs on the focuser seem prone to wear over time, which could become a durability concern with frequent use.

Ed also mentions cable management issues. The hand controller is attached to a fixed holster on the mount’s leg, but since the mount rotates during use, the cable can sometimes get tangled or pull out, potentially shutting off the telescope. He suggests an easy fix by adding Velcro to attach the controller directly to the mount, preventing cord tangling.

Despite these drawbacks, he acknowledges that the SLT130 is capable of delivering good views. During his test sessions, he successfully observed celestial objects such as the Andromeda Galaxy (M31), the Hercules Globular Cluster (M13), and the Dumbbell Nebula (M27). He notes that go-to systems can struggle with accuracy, especially when moving between objects on opposite sides of the meridian, but in this case, the SLT130 performed reasonably well.

When it comes to long-term usability, Ed remains neutral on the SLT130. He sees both reasons to buy it and reasons to avoid it. He believes that if a beginner is patient and determined, the telescope can be a valuable learning tool. Its optical tube can also be removed and placed on a sturdier mount in the future, allowing users to upgrade over time. However, in most cases, he observes that beginners who struggle with the complexity of computerized alignment often become frustrated and abandon the hobby entirely. Those who do stick with it typically end up upgrading to a different telescope sooner rather than later.

Given the telescope’s strengths and weaknesses, Ed concludes that if he were a beginner with $500 to spend, he would instead choose a 6-inch Dobsonian reflector. While this alternative lacks a computerized system, it provides a much more stable mount, superior ease of use, and an overall better experience for visual observation.

Ultimately, the SLT130 is a telescope that has potential but also notable limitations. It can serve as a useful introductory tool for those willing to navigate its quirks, but beginners looking for a straightforward, frustration-free experience may be better off with a simpler, manually operated alternative.

Buy the Celestron Nexstar 130SLT