Sky-Watcher Pro 120ED APO - 120mm Refractor Telescope

Sky-Watcher Pro 120ED APO - 120mm Refractor Telescope
Item # SW-S11130
  • The Sky-Watcher Pro 120ED APO f/7.5 Refractor telescope will blow you away!
  • The optics are made with a Schott glass positive front Crown element and second lens element fabricated of FPL-53.
  • All lenses in the Sky-Watcher Pro 120ED are uniformly air-spaced in their cell housings.
  • Sky-Watcher's Metallic High Transmission Coatings are then applied to each air-to-glass lens surface, culminating in well-corrected, high-contrast images with virtually no false color.
  • The Sky-Watcher Pro 120ED telescope comes with a 2" Crayford-style focuser, 9X50 RA finder, a 2" dielectric diagonal, two 1.25" eyepieces with long eye relief (20mm & 5mm), mounting hardware, and an aluminum carry case!


Serious Amateurs Will Love the Sky-Watcher Pro 120mm ED APO Refractor...

Sky-Watcher high-performance ED-APO refractors offer 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 imbedded in black velvet. Sky-Watcher ED APO refractors 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 PRO 120ED APO Refractor...

The additional aperture compared to a 100mm diameter lens provides a dramatic increase in resolution and a heightened 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 Sky-Watcher 120ED telescope, with massive walls and a basin that is 14,000 thousand feet deep. One of the Moon's southernmost craters, Clavius, is a very large crater 145 miles across. It is located south of Tycho. In this same area you will find the craters Maginus and Longomotanus, which are also very worthy of exploration. 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 Rect (the Straight Wall), an 800-foot mountain that is a “must see" for amateur astronomers. Your Sky-Watcher 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, you'll find 3 craters grouped together: 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". Nearby are Alphonsus, a 70 mile wide crater, and Ptolemaus, a prominent ancient crater 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. 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.

Planets are spectacular with the Sky-Watcher 120ED: The inner solar system presents the colorful rusty-red planet Mars. Mars is a challenge for amateur astronomers, but your Sky Watcher 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 Sky-Watcher 120 ED telescope. 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 polar cap is in stark contrast to the redish-orange surface landscape of the rest of the planet. The gas giant, Jupiter, displays 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 simply stunning. View the rings and clearly see Cassini’s Division and cloud belts across the equator.

Enjoy the Wonders of Deep-Space: Enjoy the hunt for double stars like Epsilon Lyrae, the “double-double" in Lyra, or, always a star party favorite, the beautiful double star Alberio, located in the tail of Cygnus the Swan, 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 Sky-Watcher 120ED. Algol, an eclipsing variable star, sometimes called the “Winking Eye" fluctuates in brightness, and Aldebaran, a beautiful orange giant in the constellation of Taurus, are both delightful sights to view with the SW 120ED. Tight globular star clusters like M13 in Hercules appear like a beehive of crisp stellar pin points circling the central core when viewed with a good refractor like the Sky-Watcher 120ED. M92, also in the constellation of Hercules, is a very compact globular with a bright core. It is also a great object to view with the SW 120ED. 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 Sky-Watcher 120ED provide performance on a par with a reflector of perhaps up to 7" in diameter on lunar, planetary, double-stars, globular star clusters, even the brighter nebulae. 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 Sky-Watcher Pro 120ED APO performs superbly, delivering crisp, high-fidelity imaging of solar phenomena (with proper filters) 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-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-back skies and faithful, contrast-rich views of planetary and deep-space phenomenon 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 optical design assures virtual elimination of secondary, residual “false color" normally present in 2-element achromatic lens designs using Crown and Flint glass. Sky-Watcher APO refractors utilize a second lens element made from the mineral fluorite instead of Flint glass. Fluorite, CaF2, is a halide with unique properties and a hardness of only four. It is an exotic and difficult material to fabricate into a lens. Hence the cost of manufacturing a fluorite lens is quite high compared to a Flint lens element, for instance.

Why fluorite? Fluorite’s molecular properties have several distinct advantages. First, it has superior dispersion characteristics compared to pure silica-based glass. It functions as a high-index lens with very low dispersion. We use the term ED to signify “Extra-low Dispersion". Fluorite also corrects well for spherical aberration. Sky-Watcher utilizes only the very finest available fluorite lens, FPL-53.

The Sky-Watcher 120ED also benefits from the inclusion of Schott glass 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.

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.

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.

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

Other Highlights of the Sky-Watcher 120ED Telescope...

  • Optical focus is achieved by means of a mechanically ultra-smooth, backlash-free, precision 2" Crayford-style rack & pinion focuser-assembly. This focuser offers 2-speed fine and ultra-fine focusing adjustments.

  • 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.

  • The telescope is supplied with a right-angle 9x50mm viewfinder with bracket; a 2" dielectric diagonal; two 1.25" LE (Long Eye Relief) eyepieces (LE20mm and LE5mm); a 1.25" focuser adaptor; tube ring attachment hardware for mounting to the Sky-Watcher EQ5PRO Mount (or other compatible mount), and a foam lined aluminum carry/storage case.
Sky-Watcher Product Number: S11130
Additional Information

Additional Information

SKU SW-S11130
UPC Code 50234111300
Manufacturer Sky-Watcher
Telescope Series Sky-Watcher Pro
Optical Design Refractor - Apochromatic
Mount Type None - Optical Tube Only
Warranty 1 Year Warranty
Telescope Aperture 4.72"
Telescope Focal Length 900mm
Telescope Focal Ratio f/7.5
Highest Useful Magnification 283x
Limiting Stellar Magnitude 12.9
Optical Coatings Fully Multi-Coated
Dew Shield Included? Yes
Eyepiece(s) Included 20mm, 5mm
Optical Tube Outer Diameter Not supplied by manufacturer
Length of Optical Tube 37.8"
Optical Tube Weight 11.3 lb.
Tube Color or Finish Gloss Black
Finder Included 9 x 50 Optical Finder
Mount Weight N/A
Alignment Procedure N/A
Objects in Database N/A
Counterweights Included N/A
Power Adapter Included None - Does Not Require Power
Tripod Type Included None, Sold Separately
Total Telescope Weight N/A

Customer Reviews 4 item(s)

This is a beast!
Despite having the specs this is bigger than I imagined. It is very well built and solid. Views are crisp and sharp with the supplied eyepieces. You will not be disappointed with this scope. I did add weight to the back end to move the balance point forward so that the eyepiece is higher at zenith.
1= Houston, We Have a Problem & 5= It's Out of This World
Review by Blink / (Posted on 9/17/2014)
skywatcher 120ed
Great telescope! No false color seen on full moon. Great price too! Only one complaint, Since I bought it, the curse of the bad skies has followed me here in California, only about 10 decent nights of viewing from December 15th until April 17th. You will love this scope.

Bob in Oakland, Calif.
1= Houston, We Have a Problem & 5= It's Out of This World
Review by bob / (Posted on 4/27/2010)
120mm ED APO
Purchased the Sky-Watcher ED about 5 months ago with some hesitation.I had 8 Celestron Nexstar Cas. as a primary scope, and was very happy with it...I began with Jupiter, as I was doing much research, including sketches and drawings...The contrast, sharpness, and detail of equitorial belts,festoons, swirls etc. etc. incredible...Transists of moons, eclipses, were spectacular...My 8 couldn't even come close as per detail or contrast and sharpness. Weather permitting, I was out almost every night using my Sky-Watcher 120mm APO with the same above results. The lunar views just took my breath away. No off color destortion even with using 300X ++.
I now own a Sky-Watcher 80MM ED 3.1 APO for grab and go....And the the Celestron Nexstar.....Well.. I sold it....
If the scope cost $1000.00 more than I paid, it would be still worth every cent............
1= Houston, We Have a Problem & 5= It's Out of This World
Review by Les / (Posted on 11/4/2009)
Where is the false color??
Working here at OPT, I had an opportunity to take one of these 120ED's home for a while and play with it.

Being a large F7.5 ED doublet, I was expecting a fair bit of false color... at F7.5 one would expect a 120mm doublet to be a semi apo at best, but this scope proved otherwise.

I was at a large public outreach in the middle of the city the first time I used it. I had it mounted on a basic manual CG5 mount with a pier extension, and was suprised that it only needed one 11 lb counterweight to balance!

It was cloudy but we had some periods of sucker holes, and M45 with a 2 30mm widefield eyepiece was what I was showing. The contrast was wonderfull, and the stars were fine pinpoints. Not a good test for false color, but rest assured there was none. A quarter moon was peeking through. I went all the way to 360x with a 2.5mm planetary eyepiece, and could see NO false color, even on the limb. I did a doubletake, I was VERY impressed!

The focuser worked well after a tension adjustment that was easily done with an allen wrench. The included case, rings, vixen style dovetail bar, 2 dielectric diagonal, 8x50 right angle finder and 25/5mm eyepieces make the package very appealing for the price. The 5mm is a long eye relief design, but not very wide, I would say about 45deg apparent field.

I put the scope on a G11 mount to try some quick unguided exposures of m45 and m42 as a test, and I was pleased to see that with an APS sized DSLR, a field flattener was not necessary, and false color was very low, similar to the celestron/orion/vixen 80ED, possibly a tad less even. Whatever they did to improve the color performance defintely worked!

For anyone looking for maximum bang for the buck in a large entry priced APO, there is no better scope at a better price.

1= Houston, We Have a Problem & 5= It's Out of This World
Review by Keith Hoffman / (Posted on 3/18/2009)
Included Items

Included Items

  • Sky-Watcher Pro 120ED OTA
  • 2" Crayford Focuser
  • 9X50 Finderscope
  • 2" Dielectric Diagonal
  • 20mm Eyepiece
  • 5mm Eyepiece
  • Mounting Hardware
  • Aluminum Carrying Case
Questions & Answers

Product Questions

How does 120mm ed work on planetary photography.
Can you recommend a suitable focal reducer for this scope?
can the skywatcher 120 be mounted on a Celestron advanced VX mount without any extra hardware?
I have this scope on the Celestron AVX mount and it's a great rig. Two questions: What is the thumbscrew on top of the forward mount ring for? Also, how can I piggyback the Orion 127mm Mak on the Sky-Watcher Pro 120? Thanks very much. t.
The description states the ED element is fluorite. Is it? Or is it Fpl-53?
What other GoTo mounts do you carry at ~$1000, that would work well with this scope for visual, and some light AP?
Can this telescope be used with Orin Atlas go-to mount ?
On Sky-Watcher Pro 120 ED APO,, what is mounting hardware?



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