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Sky-Watcher ProED 100mm Doublet APO Refractor

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1 customer reviews

Price: $875.00


  • Manufacturer: Sky-Watcher USA
  • MPN: S11120
  • SKU: S11120
  • Availability: Ships from Warehouse

*Is ONLY to the LOWER 48.
Not Alaska/Hawaii/ PR/Guam/Thailand, etc


  • 100 mm apochromatic Refractor with ED Schott BK-7 and FPL-53 ED glass
  • 900 mm focal length (f/9)
  • Dual-speed 2″ Crayford-type focuser with 1.25″ adaptor
  • 8×50 RA erect-image finderscope
  • 2″ dielectric diagonal
  • 20 mm and 5 mm 1.25″ eyepieces
  • Tube-ring attachment hardware n Aluminum carry case

 

Product Description

SW PRO 100ED APO Refractor: When You Demand the Best!

Sky-Watcher is a leader in the design and manufacturer of ED-APO systems.  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 decades.  This telescope is designed for a lifetime of astronomical enjoyment!

Observing with the Sky-Watcher PRO ED-APO 100mm Refractor

Turning the telescope to the first quarter Moon, the Apennine Mountains snap into focus revealing a cornucopia of jagged mountain ridges, canyons, and numerous small craters in razor-sharp detail.  Not far removed, reaching skyward the crater wall of Archimedes pops into view in bold relief against the smooth flatlands that transverse the distance between it and the Apennine Mountains.  This is lunar observing at its best – HD style.  The gas giant Jupiter displays its swirling equatorial bands in high-definition with festoons, and tonality within the bands.  The great spot is clearly visible, discreetly contrasted from the surrounding Jovian landscape.  Saturn’s storied surface phenomenon is simply stunning.  Hunt down double stars like Epsilon Lyrae, the “double-double” in Lyra.  A 100mm refractor will provide a crisp well defined image superior to even a larger reflector.  Always a star-party favorite, Alberio located in the tail of Cygnus never fails to please as it is a beautiful double.  Alberio appears like a gold sparkler and its companion looks blue-green.  It is a perfect refractor object.  Compact globular star clusters lend themselves well to a refractor. Located outside our galaxy the globular M2 will probably resolve more stars in a 4″ refractor than a 6″ reflector.  M4, M10 and many other globular cluster can be seen well with a 100mm refractor.  M13, the fantastic globular in Hercules is a stunning sight in a 100mm refractor.  The bright central cores of prominent nebulae can be seen and the brightest stars can be resolved.  This is just the beginning of an incredible journey of exploration possible with a SW ED-APO 100mm refractor.

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-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 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.

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 with 1.25 adaptor.  This focuser operates at 2 speeds for 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 viewfinder with bracket; 2” dielectric diagonal; two 1.25” LE (Long Eye relief) eyepieces (LET20mm and LET5mm); 1.25” focuser adaptor; and tube ring attachment hardware that works with compatible mounts.








Customers Reviews

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Most Helpful Customer Reviews

Outstanding ED refractor at a terrific price.

By James Schwartz on December, 11th 2017

As soon as I saw the announcement of a sale for Sky-Watcher telescopes in the December Sky and Telescope magazine I called the very knowledgeable Gary Pierson at Anacortes to get on the list for their 100 Pro ED refractor. Having read a number of favorable reviews of this scope I had been ready to buy one at the regular price of $769 and definitely couldn't pass up the $649 sale price. Gary worked his usual magic and, despite the very limited supply of the 100Pro ED, I found one at my door in just a few weeks. Not only did the box have the tube assembly, but the scope comes with a sturdy aluminum case, tube rings and vixen dovetail, a nice 90 degree finder, 2 inch dialectric diagonal and two better than average eyepieces.Of course, the scope would not be a bargain unless it performed well. I have used it three or four time under clear (but light polluted) suburban Florida skies with fair to good seeing conditions. First I performed several star tests with high power on three stars with different brightness. All of the tests showed textbook Airy rings which are just as the amateur websites show that they should look in a well corrected apo refractor. With regard to false color, it was pretty much absent except when the limb of the Moon got to the very edge of the field of view. The same with bright stars--no color until they were about to go out of view at which point a slight purplish halo appeared. Anything viewed in the main 90 percent of the field had no color that I could see even the limb of the Moon. Lunar craters and mountains had black shadow edges with excellent sharp features having no false color.I was particularly pleased with the contrast this scope produced even in my horribly light polluted gray looking skies. In the scope the sky looked almost black with beautiful, bright stars sprinkled across the field (way better than even my old 8 inch reflector). Star clusters just popped out of the background and star colors, especially reds, were intense.Mechanically the scope is solid, but not too heavy. The focuser is well made, though it needed some adjustments to give it a smooth, non-slip feel. Not a Moonlite or Feather Touch but more than adequate.

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