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Sky-Watcher PRO 100ED APO Refractor OTA

Item# CELE426

(2 Ratings)

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  • 100mm APO Refractor with ED Schott glass
  • 900mm focal length f/9
  • Dual Speed Crayford Focuser
  • 8x50 RA viewfinder
  • 2" Dielectric diagonal
  • Aluminum Carry Case
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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 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.   


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 rack & pinion 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 the SW EQ5P mount.  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

SW PRO ED-APO models are also supplied with a RA 8x50mm viewfinder with bracket; 2" dielectric diagonal; two 1.25" LE (Long Eye Relief) eyepieces (LE20mm and LE5mm); 1.25" focuser adaptor; and tube ring attachment hardware for mounting to the Sky-Watcher EQ5PRO Mount (or other compatible mount), and a foam lined aluminum carry/ storage case for optical tube and accessories is included.


  • SKU S11120
  • Shipping Weight 27.00 lbs
  • Optical Design ED Refractor
  • Aperture (Diameter) 100mm
  • Focal Length 900mm
  • F-Ratio F/9
  • Highest Practical Power 200x
  • Faintest Stellar Magnitude 12.7
  • Resolving Power 1.15
  • Finderscope 9x50
  • Focuser Diameter 2"
  • Diagonal 90° Star Diagonal
  • Eyepiece(s) 1.25" LET 20 and 5
  • Piggyback Bracket YES
  • Tube Weight 10 lbs.
  • Tube Dimension (dia. x length) 10 cm x 92cm

Supplier Sku:
Shipping Restrictions:
Available for shipment to the USA and Canada only.

Dimensions & Specifications

Recommended Usage



Sky Watcher



Telescopes Series

Sky Watcher ED PRO Refractor Telescopes

Optical Design




Focal Length


Focal Ratio


Highest Useful Magnification


User Level

For the Enthusiast


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The Perfect Accessory

Customer Reviews


by PowerReviews
Sky WatcherSky-Watcher PRO 100ED APO Refractor OTA

(based on 2 reviews)

Ratings Distribution

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Reviewed by 2 customers

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(0 of 12 customers found this review helpful)


A beautiful Telescope

By Randy

from Fort Wayne

About Me Casual/ Recreational

Verified Buyer


  • Accurate
  • Compact
  • Easy to Use
  • Lightweight
  • Quality Lenses
  • Strong Construction


    Best Uses

    • Astronomy

    Comments about Sky Watcher Sky-Watcher PRO 100ED APO Refractor OTA:

    easy to use

    • Was this a gift?:
    • Yes

    (24 of 24 customers found this review helpful)


    Incredible bang for the buck!

    By Jay

    from Nashville TN

    About Me Avid Adventurer

    Verified Buyer


    • Lightweight
    • Quality Lenses


    • Focuser uses set screws

    Best Uses

    • Astronomy
    • Bird Watching

    Comments about Sky Watcher Sky-Watcher PRO 100ED APO Refractor OTA:

    I bought this to bridge a gap between a 72mm scope and an 8"sct. The optics use FPL-53 glass for excellent color correction, the dual speed focuser is very smooth, but may require some adjustment if you plan on using the heaviest of super wide field eyepieces. The internal baffling is excellent, especially for a scope in this price range. Tube weight is also quite low, which is a plus when it comes to choosing a mount. The supplied diagonal is nice, the eyepieces not so much. They are fine for outreach type public viewing, where many people seem uncomfortable using their premium eyepieces. The only real complaint is have is with the focuser draw tube. Instead of using a brass compression ring, as most decent quality modern scopes use, the manufacturer made the unfortunate design choice of using dual set screws, which can, and in all likelihood will, result in scratches to the nosepiece of any diagonal or accessory used in it. If not for this one detail, I would rate it a full 5 stars, but this will be a turn off for some. All in all, it is a fantastic value at the asking price!

    • Was this a gift?:
    • No

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