Sky-Watcher ProED 120mm Doublet APO Refractor
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Sky-Watcher ProED 120mm Doublet APO Refractor

The Sky-Watcher ProED 120mm Doublet APO refractor telescope is an excellent choice for planetary observing and has enough aperture to also reveal many deep space objects.

Serious Amateurs, in particular, will love the SkyWatcher 120mm ED Pro refractor for its premium optical performance.

Sky-Watcher Pro 120ED APO Refractor

Sky-Watcher Pro 120ED APO with a CGEM mount offers premium optical performance for the discriminating amateur astronomer. Refractors are coveted for their superb contrast, high-definition and coal-black sky background that make stars appear like diamonds embedded in black velvet. The quality APO refractors from Sky-Watcher utilize the most modern optical glasses and fabricating techniques to deliver the ultimate in high-fidelity astronomical imaging. Subtle details pop as never seen before in telescopes of lesser optical capability.

Observing With the Sky-Watcher PROED 120mm Refractor Telescope

The additional aperture compared to a 100-mm diameter lens provides a dramatic increase in resolution and a heighten sense of seeing lunar and planetary surface phenomenon in seemingly 3D high-definition.

Touring the Moon

The rugged Southern Highlands of the lunar surface are rich in craters. To the southeast, the famous crater Theophilus is 65 miles across. The raised triple-peaked central area is striking to observe in your SW 120ED. The crater has massive walls, and the basin is 14,000 feet deep. One of the southernmost craters, Clavius, is a very large crater, measuring at about 145 miles across. It is located just south of Tycho. In this same area can be found craters Maginus and Longomotanus which are also very worthy of exploration. Up to the north, the young crater Tycho dominates the southern lunar landscape. Named after the famous Danish astronomer Tycho Brahe, it is a spectacular sight with very high-rimmed walls.

North of Tycho appearing brightly in a basin is the famous Rupes Recta (the Straight Wall), an 800-foot mountain that is a “must see" for amateur astronomers. Your SW 120ED will show it clearly and sharply the way you want to see it.

On the north end of Mare Nubium, almost on the lunar N-S and E-W center line, three craters are grouped:

  • Arzachel, a young impact crater 60 miles across and 13,000 feet deep, shows a terraced structure and a system of channel-like narrow depressions in its basin called “rilles"
  • Alphonsus, a 70-mile wide crater
  • Ptolemaeus, a prominent ancient crater that’s 90 miles across with a heavily worn dark interior

The Earth’s Moon offers a treasure trove of fascinating detail to explore with your SW 120ED-APO EQ5 PRO. With your SW120ED, you can get an impressive view of everything on the moon’s visible surface. We have only featured a relative few examples of what is available. The views you will experience are so clear and sharp it might just feel like a veritable space-walk.

Spectacular Planetary Views

The inner solar-system presents numerous planets you can marvel over. These include the colorful rusty-red planet Mars. Mars is a challenge for amateur astronomers, but your SW 120ED will show some very interesting detail. Olympus Mons, a volcanic crater 375-miles across and 16-miles high, is just one of the quests your capable SW120ED can tackle. Nirgal Vallis is a channel 600 miles long that responds well to the razor sharp contrast provided by the SW 120ED. The Grand Canyon of Mars, Valles Mariners, dwarfs that of our Earth’s Grand Canyon, but it still requires superb optics to view even though it is 150 miles wide and 4 miles deep. When prominent, the gleaming white Mars’ polar cap is in stark contrast to the reddish-orange surface landscape of the rest of the planet. The SW 120ED will show you this detail like you want to see it.

The gas giant Jupiter is another beautiful neighbor, displaying its swirling equatorial bands in high-definition with festoons and tonality within the bands. With regular observation, you will be able to follow storms and disturbances cross the planet in the southern equatorial band.

Saturn’s storied surface phenomenon is another stunning view you can see with the SkyWatcher 120mm ED Pro. View the rings and clearly see Cassini's Division and cloud belts across its equator.

Wonders of Deep-Space

Beyond our familiar solar-system, you can hunt down infinite wonders, like the double stars Epsilon Lyrae and the “double-double" in Lyra. A 120 mm ED-APO refractor will provide a crisp, well-defined image on par with up to a 7" reflector. Always a star-party favorite, the beautiful double Alberio located in the tail of Cygnus is sensational. Alberio appears like a gold sparkler, and its companion looks like a blue-green sparkler. It is a perfect object to view with your SW 120ED.

Other stars include Algol, an eclipsing variable star that’s sometimes called the “winking eye." It fluctuates in brightness and is a suitable subject for the Sky-Watcher ProED 120mm Refractor Telescope. Aldebaran is another, a beautiful orange giant in the Constellation Taurus is a delightful sight to view with the SW 120ED. In the eastern corner of Constellation Orion, Rigel, a bright blue double has a blue-green companion that requires excellent optics to see, a worthy subject for the SW 120ED.

Tight globular star clusters like M13 in the Constellation Hercules appear like a beehive of crisp stellar pin points circling the central core, star upon thousands of stars. Compact globular star clusters lend themselves well to a refractor as well, including M5. M92, in the Constellation Hercules, is very compact globular with a bright core. It is a great object to view with the SW 120ED. M4, M10 and many other globular clusters can be seen well with the SW 120ED-APO refractor. The bright central cores of prominent nebulae can be seen and the brightest stars can be observed illuminating the glowing nebulosity which appears as ghostly apparitions.

The superb capabilities of the SW 120ED provide performance on a par with a reflector of perhaps up to 7" in diameter on lunar, planetary, double-stars, globular star clusters. Depending on your ranking of unobstructed high-contrast as a necessary attribute, even the brighter nebulae may look better to you in an SW 120ED. These objects will stand out in bold relief contrasted against a very dark velvet-black sky background. Many advanced amateur astronomers feel the ED-APO experience is astronomy’s richest.

As an astrograph, the SW PRO 120ED APO performs superbly delivering crisp, high-fidelity imaging of planetary, lunar and aperture appropriate deep-space phenomenon.

Refractors - the Ultimate Imaging Instruments

In a given aperture size, refractors will always exhibit sharper images than other optical designs because the refractor concentrates more light into the central airy-disk and first diffraction rings. There is no diffraction pattern interference caused by a diagonal mirror or secondary mirror being suspended in the optical path (central obstruction) as is the case with reflectors.

Sky-Watcher ED-APOs - the Ultimate Refractors

Sky-Watcher ED-APO refractors provide the finest images obtainable - bar none - in their design class. If you are on a quest for the ultimate in pristine, near textbook-perfect astronomical imaging, look no further! Sky-Watcher ED apochromatic refractors deliver dramatic coal-black skies and faithful, contrast-rich views of planetary and deep-space phenomena that are second to none. Sky-Watcher ED-APO refractors are the logical choice as an investment in advanced instrumentation for exceptional viewing or photography.

Virtually Eliminates Residual Chromatic Aberration

The Sky-Watcher ED-APO design assures virtual elimination of residual “false color" (i.e. chromatic aberration) normally present in 2-element achromatic lens designs which utilize standard crown and flint glasses. Sky-Watcher APO refractors utilize the finest extra-low dispersion (ED) glass available, FPL-53. This results in the best color correction for an ED doublet lens.

Schott Glass Used in Selected Models for Crown Element

Select models of ED-APO refractors will benefit from the inclusion of Schott glass being used for the positive front Crown element in the objective. Schott is the recognized world leader in glass utilized for precision optical lens systems, including medical instrumentation and famous-brand camera lenses. While Schott glass is only used in selected models, all other models utilize top-quality, Grade-A glass from perhaps less famous but, nonetheless, highly respected, high-quality glass manufacturers.

Pride and Perfection in Optical Manufacturing

Every lens element is individually inspected for purity and absence of striae and other image-degrading imperfections. Every lens is pitched polished to exacting standards of optical fabrication and performance by highly skilled opticians utilizing state-of-the-art methodology and rigidly controlled optical testing procedures. The result is high-quality, diffraction-limited optics performing to the theoretical limits of their respective aperture sizes. All lenses are uniformly air-spaced in their cell housings.

Sky-Watcher offers one of the most extensive lines of ED-APOCHROMATIC refractors in the world. Using only the finest fabrication materials available, Sky-Watcher APO refractors are manufactured to painstakingly rigorous, exacting standards of optical and mechanical quality to ensure the amateur astronomer peak performance and a great experience each and every time a Sky-Watcher ED-APO is taken into the field. We know the amateur astronomer has very high expectations regarding astronomical equipment purchases. Sky-Watcher has been delivering consistent satisfaction for over a decade.

Metallic High-Transmission Lens Coatings

Each air-to-glass lens surface has exotic anti-reflection metallic coatings applied to ensure optimum light through-put. The proprietary Sky-Watcher “Metallic High-Transmission Coatings" (MHC) are the finest photon anti-rejection coatings in their class.

Light-Baffled Optical Systems

The objective lens cell is light-baffled to reject stray, unfocused light. The draw tube is likewise baffled to ensure optimum contrast. The tube interior is flat blackened to help prevent unfocused internal light reflections from reaching the focal plane.

Precision 2" Crayford-style Focuser is Standard

Optical focus is achieved using a mechanically ultra-smooth, backlash-free, precision2" Crayford-style focuser-assembly. This focuser offers 2-speed fine and ultra-fine focusing adjustments.

Tube Materials

The optical tube material is aluminum, powder-coated reflective gloss black with gold fleck accent. The front and back cells are cast-aluminum painted white or black.

Telescope Tube Attachment Hardware

The Sky-Watcher APO optical tubes come with attachment hardware that allows them to be securely fastened to compatible mounts. The quick-release tube rings provided with SW ED-APO models 80ED, 100ED and 120ED are cast-aluminum, painted white.

Included Components for Selected Models

All Sky-Watcher USA ProEDs come with 2-speed backlash-free 2” Crayford-style focusers and quality foam-lined metal carrying cases as standard equipment. ProEDs are also supplied with right-angle 8x50mm viewfinders with brackets, 2” dielectric diagonals, two 1.25” LE (Long Eye relief) eyepieces (LET20mm and LET5mm), a 1.25” focuser adaptor and a tube ring attachment hardware that works with compatible mounts.

Learn More the Sky-Watcher 120mm ED PRO

If you’re interested in purchasing the SW 120mm ProED, we have it in stock at Skies Unlimited. Browse our selection today either online or at our physical location. If you want it delivered to your location, you may be interested in our free shipping options, as well.

If you still have questions about the Sky-Watcher 120ED Apo, we can answer them. Our team of highly experienced staff members consists of amateur astronomers with years of personal and professional experience in the astronomy field. Using our knowledge and experience, we can answer any questions you might have about our SkyWatcher products, along with the other brands we carry. Whether it’s advice, specifications or dimensions, you can call Skies Unlimited today with your question and get the answer you need!

For those of you who are new to purchasing telescopes and unsure about which telescope best fits your particular needs, we can give you advice. Call or visit Skies Unlimited today to speak with a representative at our retail store location just outside of Pottstown, PA. We’ll discuss your skill level, desires and preferences and find the perfect telescope package for you.


Our price: $1679.00

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Telescope Type Apochromatic Refractor
Aperture (in.) 4.7 inches
Aperture (mm) 120 mm
Focal Ratio f/7.5
Focal Length 900 mm
Limiting Visual Magnitude 13.1
Eyepiece 1 20 mm
Magnification with Eyepiece 1 45x
Eyepiece 2 5 mm
Magnification with Eyepiece 2 180x
Focuser Type Dual-speed Crayford
Focuser Size 2-inch
Finder 8 x 50 optical right angle
Star Diagonal 2-inch dielectric mirror
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