Celestron Omni XLT 120 mm Refractor Telescope – 21090 Review

The Celestron Omni XLT 120 mm Refractor Telescope – 21090 Review You’ve Been Looking For

For over a decade, I’ve dedicated myself to exploring the world of outdoor and tactical gear, from the depths of the ocean to the highest mountain peaks. Astronomy has always been a quiet passion of mine. The Celestron Omni XLT 120 mm Refractor Telescope – 21090 promises to bridge that gap.

I was on the hunt for a telescope that could offer a blend of portability, decent aperture, and ease of use, without breaking the bank. I wanted a telescope I could easily transport to darker skies and also use for some basic astrophotography. Initial impressions were positive. The build felt solid and the optics appeared promising.

I considered the Orion SkyView Pro 102ED and the Explore Scientific ED102, both excellent telescopes. However, the Celestron offered a larger aperture for the price, and the CG-4 German Equatorial Mount seemed like a good starting point for my astrophotography aspirations. The Celestron Omni XLT 120 mm Refractor Telescope – 21090 initially excited me. I was eager to see if it could live up to its potential under a dark sky.

Real-World Testing: Putting Celestron Omni XLT 120 mm Refractor Telescope – 21090 to the Test

First Use Experience

My first test was at a local dark sky site, about an hour outside the city. The seeing conditions were average, with a bit of light pollution on the horizon. Setup was straightforward, although the equatorial mount did require some initial adjustment. The provided 25mm eyepiece offered decent views of the moon, but I quickly realized I needed more magnification to really appreciate the telescope’s potential.

I was impressed with the initial views of Jupiter and its moons. However, there was noticeable chromatic aberration (false color) around brighter objects. Despite the initial color fringing, I found the views sharp and detailed.

Extended Use & Reliability

After several months of use, the Celestron Omni XLT 120 mm Refractor Telescope – 21090 has held up remarkably well. The stainless steel tripod remains sturdy and stable. There are a few minor scratches on the optical tube from transport. I store the telescope in a padded case when not in use.

The CG-4 mount is showing some signs of wear, with the slow-motion controls becoming slightly less smooth. Regular cleaning of the optics is necessary to maintain optimal performance. This is due to dust accumulation, especially after observing sessions in open fields. The Celestron outperforms my smaller 80mm refractor in terms of light gathering and image detail. However, the chromatic aberration is more pronounced in the larger aperture Celestron.

Breaking Down the Features of Celestron Omni XLT 120 mm Refractor Telescope – 21090

Specifications

The Celestron Omni XLT 120 mm Refractor Telescope – 21090 features a 120mm aperture, which is the largest in the Omni XLT series refractor line. It boasts StarBright XLT optical coatings, designed to maximize light transmission and contrast. The focal length is 1000mm, resulting in a focal ratio of f/8.3. The telescope comes with a 25mm multi-coated eyepiece, offering 40x magnification.

The telescope utilizes a CG-4 German Equatorial Mount, equipped with setting circles and slow-motion controls. The tripod features 1.75″ stainless steel legs for added stability. These specifications are crucial for both visual observation and astrophotography. The larger aperture allows for brighter and more detailed views of faint objects. StarBright XLT coatings enhance light throughput. The equatorial mount facilitates accurate tracking of celestial objects.

Performance & Functionality

The Celestron Omni XLT 120 mm Refractor Telescope – 21090 excels at delivering sharp and detailed views of the Moon and planets. Jupiter’s cloud bands and Saturn’s rings are clearly visible, especially with higher magnification eyepieces. Deep-sky objects, such as nebulae and star clusters, are also within reach, although light pollution can be a limiting factor. The equatorial mount allows for smooth and precise tracking of objects.

The primary weakness is the noticeable chromatic aberration, particularly on bright objects. A good quality chromatic aberration filter can help mitigate this issue. The included 25mm eyepiece is adequate. However, investing in additional eyepieces with different focal lengths will significantly enhance the observing experience. It meets expectations. This telescope provides a solid platform for both visual astronomy and beginner astrophotography.

Design & Ergonomics

The Celestron Omni XLT 120 mm Refractor Telescope – 21090 is well-built and feels robust. The optical tube is made of aluminum. The CG-4 mount is constructed of metal. The telescope weighs approximately 30 pounds when fully assembled. This makes it relatively portable, but still requires some effort to transport.

The setup is straightforward. However, understanding how to properly polar align the equatorial mount takes some practice. The slow-motion controls are smooth and precise, allowing for fine adjustments during observation. The telescope’s design is functional and ergonomic. The build quality inspires confidence.

Durability & Maintenance

The Celestron Omni XLT 120 mm Refractor Telescope – 21090 is built to last. The stainless steel tripod is resistant to rust and corrosion. The aluminum optical tube is durable. Proper care and maintenance are essential to ensure longevity. This includes cleaning the optics with a microfiber cloth and storing the telescope in a dry environment.

Regular lubrication of the mount’s moving parts is recommended to maintain smooth operation. With proper care, this telescope should provide years of reliable service.

Accessories and Customization Options

The Celestron Omni XLT 120 mm Refractor Telescope – 21090 comes with a 25mm multi-coated eyepiece and a 1.25″ star diagonal. The telescope is compatible with a wide range of 1.25″ eyepieces and filters. A dual-axis motor drive (Model #93522) and a polar axis finder (Model #94221) are available as optional accessories for astrophotography. These accessories significantly enhance the telescope’s tracking capabilities.

Other popular accessories include a Barlow lens for increasing magnification and light pollution filters for improving contrast. The telescope can also be adapted for use with a DSLR camera using a T-ring adapter. The compatibility with various accessories and customization options makes this telescope highly versatile.

Pros and Cons of Celestron Omni XLT 120 mm Refractor Telescope – 21090

Who Should Buy Celestron Omni XLT 120 mm Refractor Telescope – 21090?

The Celestron Omni XLT 120 mm Refractor Telescope – 21090 is perfect for beginner to intermediate astronomers looking for a versatile telescope that offers a good balance of aperture, portability, and affordability. It is well-suited for visual observation of the Moon, planets, and brighter deep-sky objects. It can also serve as a stepping stone into astrophotography.

This telescope is not ideal for experienced astrophotographers seeking high-end performance and minimal chromatic aberration. Individuals primarily interested in deep-sky imaging may want to consider a reflector telescope with a larger aperture. Must-have accessories include a set of high-quality eyepieces, a chromatic aberration filter, and a dual-axis motor drive for astrophotography.

Conclusion on Celestron Omni XLT 120 mm Refractor Telescope – 21090

The Celestron Omni XLT 120 mm Refractor Telescope – 21090 is a solid and capable telescope that offers excellent value for the price. While it’s not without its flaws, such as the noticeable chromatic aberration, its strengths far outweigh its weaknesses. The sharp optics, durable construction, and versatile equatorial mount make it a worthwhile investment for aspiring astronomers.

The price is justified. You receive a well-rounded telescope that can provide years of enjoyment. I would personally recommend it to anyone looking for an entry-level to mid-range refractor telescope. Take the plunge. Explore the cosmos with the Celestron Omni XLT 120 mm Refractor Telescope – 21090.