Sky-Watcher Evostar 100 ED DS-Pro
  • Sky-Watcher Evostar 100 ED DS-Pro

Sky-Watcher Evostar 100 ED DS-Pro

The new EVOSTAR DS-PRO Series ED Apochromatic refractors in their stunning Black-Diamond livery, house premium optics of the same quality and performance level as our now legendary Equinox series, making them superb instruments for both imaging and visual observations. 

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100mm (4”) f/900 Fluorite ED Apochromatic Refractor Telescope  

Sky-Watcher supplied product information - 
Apochromatic Refractors, due to their unobstructed, text-book like diffraction patterns, produce the sharpest, highest quality optical imaging available, bar-none, aperture for aperture, of any telescope optical system.
These high-end telescopes all feature a doublet objective lens. One element is made from premium Japanese Ohara FPL-53 Extra-Low Dispersion (ED) glass, which virtually eliminates chromatic aberration to deliver true colour reproduction. Top quality Schott glass is utilized for the Crown element.
Each air-to-glass lens surface has exotic anti-reflection metallic coatings applied, to ensure optimum light through-put of approaching 99.5%!!
The proprietary Sky-Watcher “Metallic High-Transmission Coatings” (MHC) are the finest photon anti-rejection coatings in their class.
For a limited time only, this refractor is offered with a free 0.85X focal reducer, and lowered in price!

  • Magnification with Eyepieces Supplied: x32

  • Highest Practical Power (Potential): x300

  • Objective Lens Diameter: 100mm

  • Telescope Focal Length: 900mm (f/9) (f/7.65 with reducer)

  • Eyepiece Supplied (2"): 28mm LET

  • 2”/50.8mm Di-Electric Star Diagonal

  • 9x50 Finderscope

  • Dual-Speed 11:1 2” Crayford Focuser (Backlash-Free)

  • Multi-Coated Objective Lens

  • Supplied with Tube Rings & Mounting Plate

  • Aluminium Carrying Case

Our view

Refractors that use S-FPL53 as the low dispersion element usually have well corrected images for secondary spectrum. With short focal ratio S-FPL53 doublet refractors, (<f/8), it is still possible to see some residual colour in normal observing of bright objects. This 100mm f/9 refractor is free from axial secondary spectrum as well as can be expected from a doublet of this type. In normal use, images of the moon and planets will be as free of secondary spectrum as a good 100mm triplet refractor of shorter focal ratio. Considering the price, this instrument is the perfect aperture/focal ratio/weight for a premium refractor. It is extremely portable, will mount happily on any of the German equatorials of EQ5/CG5 and better. As a solar instrument in white light with Astrosolar filter over the aperture, the image quality is excellent. For astronomy at night, stars are pinpoint, deep-sky objects stand out well in contrast with the background sky, and planets will show all the detail a 100mm aperture can reveal. With the 0.85X reducer, it is difficult to recommend a better value for money refractor.


Try some of the 80o eyepieces with this scope, the f/9 focal ratio plus the off-axis corrections on the wide field eyepieces will result in spectacular  wide field views. Make a short dewshield to add onto the scope's dewshield, in order to lengthen it. The amount of dew we get in the UK requires a longer dewshield than is usually provided as part of the scope.


Data sheet

Optical Design
4 inch
Focal Length
900 mm
Focal Ratio

Specific References

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