Current Price: $950.00
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EvoStar 100ED / ProED 100mm Doublet APO Refractor (OTA only)

Condition: Brand New in Original Packaging

SKU: S11120_FO


  • Wide-field telescope offers wide swaths of sky in one view
  • Can be used as an astrograph for sky photography
  • Virtual elimination of residual “false color”
  • Utilizes the finest extra-low dispersion glass available
  • Schott glass used for positive front Crown in the objective
  • High-quality, diffraction-limited optics
  • Exotic anti-reflection metallic coatings
  • Objective lens cell is light-baffled to reject unfocused light
  • Tube is an aluminum, powder-coated reflective gloss black

Product Description

Fortunate indeed is the amateur astronomer with a Sky-Watcher EvoStar 100ED / ProED 100 mm Doublet APO Refractor on a clear night with transparent skies and a stable atmosphere. The EvoStar 100 mm is a wide-field telescope offering bright, wide swaths of sky in a single view. It is well suited for wide-field astronomical observation of prominent nebulae, star clusters and galaxies from a dark-sky location, or can be used as an astrograph for sky photography.

As a terrestrial spotting scope or telephoto lens, the EvoStar 100 APO performance is absolutely superb. Ultra high contrast allows the subtlest of details to be easily scrutinized under conditions of good seeing. The petite silhouette of the EvoStar 100 makes for an excellent compact, portable telescope that travels light and fits a small space. As an astrograph, the SW EvoStar 100ED delivers superb performance imaging a wide spectrum of astronomical phenomenon.


Sky-Watcher ED-APO refractors provide the finest images obtainable—bar none—in their design class. 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. 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

The EvoStar 100 mm 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.


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 the EvoStar 100 mm APO is taken into the field.


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. 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. Optical focus is achieved by means of a mechanically ultra-smooth, backlash-free, precision 2" Crayford-style focuser-assembly with 1.25" adaptor. Focuser offers 2 speeds for fine and ultra-fine focusing adjustments.

The optical tube material is aluminum, powder-coated reflective gloss black with gold fleck accent. 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 100ED,are cast-aluminum, painted white.

What's in the Box

  • EvoStar 100ED / ProED 100mm Doublet APO Refractor (OTA only)
  • Dual-speed 2" Crayford-type focuser with 1.25" adaptor
  • 1.25” Focuser Adaptor
  • 8x50 RA erect-image finderscope
  • 2” Dielectric Diagonal
  • 20 mm 1.25” Eyepiece 
  • 5 mm 1.25” Eyepiece
  • Tube Ring Attachment Hardware
  • Foam-Lined Metal Carrying Case
  • Two Year Limited Warranty


  • Optical Design: Apochromatic refractor
  • Focal length: 900 mm
  • Aperture: 3.9"
  • F-ratio: 9
  • Lens elements: 2
  • Lens glass: FPL-53 ED and Schott BK-7 glass
  • Optical Coatings: Metallic High-Transmission Coatings
  • Focuser: 2 inch dual-speed Crayford-style
  • Eyepieces: 5 mm and 20 mm 1.25 inch eyepieces
  • Finderscope: 8 x 50 right angle, correct image
  • Diagonal:  2" Star Diagonal
  • Highest useful magnification: 236x
  • Lowest useful magnification: 14x
  • Limiting stellar magnitude: 12.5
  • Resolution (Rayleigh): 1.39 arc seconds
  • Resolution (Dawes): 1.16 arc seconds
  • Light gathering power (compared to human eye): 204x
  • Mount type: V-style dovetail
  • Tube length: (inches) 36.2
  • Outer diameter (inches): 4.5625
  • Tube weight (pounds): 8.4





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