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Sky-Watcher 100ED PRO OTA (Optical Tube Assembly) Refractor

Recommended Retail Price: R13,993.50

Skywatcher Pro-Series ED refractors are built with a two-element air-spaced objective. The second element is made of the highest grade ED fluorite glass called FPL-53. This premium glass choice is a basic warranty for virtually no false color and for high contrast. The high standard set in material choice is also set in production. No effort is spared to reach optimal optical quality: Our best opticians give each objective a hand pitch polishing finishing touch. This dedication to perfection together with aspheric shaping technology are the best ways to reach a very good wavefront (*) which means virtually no aberrations and textbook star images. The quality of each ED Pro Series objective is monitored by means of Ronchi (*) test and star (**) test.

(*) The essential function of a telescope is gathering starlight without "disturbing" it. This means changing the path of the lightwaves without altering the lightwave itself. Lightwaves all together are referred to as a wavefront. Alterations in this wavefront caused by the optics should be avoided. A wavefront analysis by Ronchi test will show an absence of wavefront alterations if the black and white lines (interference pattern) are perfectly straight and parallel.

(**) The star test proves the ability of the optics to reproduce a pinpoint light source (star) as a pinpoint image. Concentric light circles will surround the pinpoint light dot. These increasingly faint light circles are unavoidable due to diffraction but being well concentric around the central light dot they are a warranty for good optical alignment of the lenses.

Performance of the Sky-Watcher ED Pro-Series refractors surely will both delight and surprise the most critical observer.

100ED OTA PRO
Diameter: 100mm
Focal Length: 900mm
F/ratio: F/9
Fully Multi-Coated Doublet Objective Lens
FPL-53 ED Fluorite Glass Objective Element
Backlash-free 2” Crayford Focuser with Brushed-Aluminium Hubs & rubber grip rings

Optical DesignED Refractor
Lens Material
Diameter100mm
Focal Length900mm
Scondary Mirror Diameter
F/ratioF/9
Highest Practical Power200x
Faintest Steller Magnitude12.7
Resoving Power1.15
Finderscope9x50*
Focuser diameter2”
Diagonal90ΒΊ Star Diagonal*
Eyepiece(s)1.25” LET 20 and 5*
Mount Typen/a
Slow-motion Controln/a
Counterweight(s)n/a
Piggyback BracketYES
Accessory Trayn/a
Ground Board Diametern/a
Ground Board Weight(s)n/a
Motor Driven/a
Go-ton/a
Tube Weight3Kgs
Tube Dimension(dia. x length)10 cm x 92cm
Tripod Height
Shipping Weight12.2kg
Shipping Carton Dimensions92.5 x30 x 23 cm3

Standard accessories may vary.
Contact your local distributor for details


  • Model: 100EDPRO-OTA
  • Shipping Weight: 12.2lbs
  • 4 Units in Stock
  • Manufactured by: Sky-Watcher


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