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Sky-Watcher Pro 120ED APO Refractor S11130

Price: $1679.00

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. SW APO refractors utilize the most modern optical glasses and fabricating techniques to deliver the ultimate in high-fidelity astronomical imaging.

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SKY-WATCHER PRO 120ED APO REFRACTOR: Serious Amateurs will Love the SW 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.  SW 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 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 145 miles across.  It is located south of Tycho.  In this same area can be found 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.  Your SW120ED will provide an impressive view.  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 can be found 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…the inner solar-system presents 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 redish-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 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 its equator.                                                                                                                                                                                                                      View

Wonders of Deep-Space…beyond the solar-system hunt down double stars like 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.  Algol, an eclipsing variable star, sometimes called the “winking eye" fluctuates in brightness and is a suitable subject for the SW 120ED.  Aldebaran, 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.  M5 is a worthy object for viewing. 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, and depending on your ranking of unobstructed high-contrast as a necessary attribute, even the brighter nebulae may look better to you in a 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 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 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 insure 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 insure 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 by means of a mechanically ultra-smooth, backlash-free, precision 2" 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 the CGEM mount. The quick-release tube rings provided with SW ED-APO models 80ED, 100ED and 120ED are cast-aluminum, painted white.

Specifications:

Optical Design

Refractor

Aperture (mm)

120 mm (4.72 in)

Focal Length (mm)

900 mm (35 in)

Focal Ratio

7.5

Eyepiece 1 (mm)

20 mm (0.79 in)

Magnification 1

45 x

Eyepiece 2 (mm)

5 mm (0.2 in)

Magnification 2

180 x

Finderscope

8x50 RA Viewfinder

Highest Useful Magnification

283 x

Lowest Useful Magnification

17 x

Limiting Stellar Magnitude

12.9

Resolution (Rayleigh)

1.16 arc seconds

Resolution (Dawes)

0.97 arc seconds

Light Gathering Power (Compared to human eye)

294 x

Optical Tube Length

37.7952756 in (960 mm)

Optical Tube Weight

11.3097141 lbs (5.13 kg)

 

SKY-WATCHER USA TWO YEAR LIMITED WARRANTY

A. Sky-Watcher USA warrants your telescope to be free from defects in materials and workmanship for two years. Sky-Watcher USA will repair or replace such product or part thereof which, upon inspection by Sky-Watcher USA, is found to be defective in materials or workmanship. As a condition to the obligation of Sky-Watcher USA to repair or replace such product, the product must be returned to Sky-Watcher USA together with proof-of-purchase satisfactory to Sky-Watcher USA.

B. The Proper Return Authorization Number must be obtained from Sky-Watcher USA in advance of return. Call Sky-Watcher USA at (310) 803-5953 to receive the number to be displayed on the outside of your shipping container.

All returns must be accompanied by a written statement setting forth the name, address, and daytime telephone number of the owner, together with a brief description of any claimed defects. Parts or product for which replacement is made shall become the property of Sky-Watcher USA. The customer shall be responsible for all costs of transportation and insurance, both to and from the factory of Sky-Watcher USA, and shall be required to prepay such costs.

Sky-Watcher USA shall use reasonable efforts to repair or replace any telescope covered by this warranty within thirty days of receipt. In the event repair or replacement shall require more than thirty days, Sky-Watcher USA shall notify the customer accordingly. Sky-Watcher USA reserves the right to replace any product which has been discontinued from its product line with a new product of comparable value and function. This warranty shall be void and of no force of effect in the event a covered product has been modified in design or function, or subjected to abuse, misuse, mishandling or unauthorized repair. Further, product malfunction or deterioration due to normal wear is not covered by this warranty.

SKY-WATCHER USA DISCLAIMS ANY WARRANTIES, EXPRESS OR IMPLIED, WHETHER OF MERCHANTABILITY OF FITNESS FOR A PARTICULAR USE, EXCEPT AS EXPRESSLY SET FORTH HEREIN. THE SOLE OBLIGATION OF SKY-WATCHER USA UNDER THIS LIMITED WARRANTY SHALL BE TO REPAIR OR REPLACE THE COVERED PRODUCT, IN ACCORDANCE WITH THE TERMS SET FORTH HEREIN. SKY-WATCHER USA EXPRESSLY DISCLAIMS ANY LOST PROFITS, GENERAL, SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES WHICH MAY RESULT FROM BREACH OF ANY WARRANTY, OR ARISING OUT OF THE USE OR INABILITY TO USE ANY SKY-WATCHER USA PRODUCT. ANY WARRANTIES WHICH ARE IMPLIED AND WHICH CANNOT BE DISCLAIMED SHALL BE LIMITED IN DURATION TO A TERM OF TWO YEARS FROM THE DATE OF ORIGINAL RETAIL PURCHASE.

Some states do not allow the exclusion or limitation of incidental or consequential damages or limitation on how long an implied warranty lasts, so the above limitations and exclusions may not apply to you.

This warranty gives you specific legal rights, and you may also have other rights which vary from state to state. Sky-Watcher USA reserves the right to modify or discontinue, without prior notice to you, any model or style telescop

If warranty problems arise, or if you need assistance in using your telescope contact:

Sky-Watcher USA

Customer Service Department

475 Alaska Avenue

Torrance, CA 90503

Tel. (310) 803-5953

Toll-free (855) 327-1587

Monday-Friday 8AM-4:30PM CST

NOTE: This warranty is valid to U.S.A. customers who have purchased this product from an authorized Sky-Watcher USA dealer in the U.S.A.

Product's SKU: S11130

Product's UPC: 050234111300

Sky-Watcher Pro 120ED APO Refractor S11130

Manufacturer details

David Shen, the founder of Sky-Watcher, started pursuing his interest in optics design and star observing when he was 26, working as a polishing technician at a research institute in Taiwan. It was a lovely summer night after work that the bright stars urged David to observe them with a telescope. After placing the telescope on top of the hood of his car, the view of the magnificent rings from the Saturn planet greatly moved David. That night was deeply engraved in David's memory since and constantly inspires him to live his dream: "Building High-quality and Affordable Telescopes for Everyone".

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