Jacobs Digital

09 480 5903


9 Mokoia Road

Birkenhead, Auckland 0626

OPEN: 9am to 5pm

Monday to Saturday

SkyWatcher 100/900 Black Diamond ED Doublet Refractor Telescope

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SkyWatcher 100/900 Black Diamond ED Doublet Refractor Telescope-Telescope-Jacobs Photo and Digital

SkyWatcher 100/900 Black Diamond ED Doublet Refractor Telescope

SKU: ---

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Our Price

or 12 months interest free


or 6 easy payments of $296.66


or 4 easy payments of $445.00



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About this product

This telescope with its well corrected chromatic aberration is ideal for high-contrast planetary observing. With a 100mm aperture and 900mm focal length, this doublet ED telescope has high performance optics and collects about 200 times more light than the naked eye with an exit pupil of 7mm. The use of FPL-53 ED glass means that there is almost no colour aberration and an aperture ratio of f9 means this is reduced even further.

ED glass (extra low dispersion) has very low colour dispersion and a low refractive index. Excellent correction of chromatic aberration is achieved by the combination of this special glass with other optical glass. Improved contrast is achieved by the use of crown glass from the German firm of Schott. The metallic high transmission coating applied to the lenses ensures high light transmission. Star clusters are especially aesthetically pleasing, with images very nearly achieving the 'pin sharp stars' often described when observing through refractors. Sharp images across the entire image can be achieved in conjunction with an optional field flattener. The tube is equipped with a robust 2 inch Crayford focuser with a 1:11 reduction ratio for fine focusing - especially important for astrophotography. The refractor can also be turned into a powerful spotting scope for nature observing by the connection of suitable accessories. Also, the telescope is visually a little gem - boasting an elegant design of the highest calibre, with the tube and finder scope gleaming in an aesthetically pleasing tone of black and the white dew shield and the tube rings acting as stylish contrasting elements within the overall design.

The advantages in a nutshell:

  • ED optics provide colour aberration-free images
  • high-quality glass from Schott, the German market leader in glass production
  • metallic high transmission coating

*Special Order item, please contact us for delivery time*


Type Refractor
Type of build Apochromat Doublet
Aperture (mm) 100
Focal length (mm) 900
Aperture ratio 9
Resolving capacity 1,15
Limit value (mag) 11,8
Light gathering capacity 204
Max. useful magnification 200
Tube weight (kg) 3,5

Eyepiece holder

Type of build Crayford
Connection ( to eyepiece) 2
Gear reduction 1:10 Fine movement


GoTo control no
Mounting type no mount
Type of build OTA
Tracking no

Included accessories

2'' eyepieces LET Okular 28mm
Finderscope 9x50
Deviating optics 2", 90° star diagonal
Miscellaneous Aluminium case

Area of application

Moon & Planets yes
Nebulae & galaxies no
Nature observation yes
Astrophotography yes
Sun not recommended (Only with appropriate Sun filter)

Recommended for

Beginners no
Advanced yes
Experienced amateurs yes


In the Box:

  • ED100 OTA
  • 2″ Diagonal
  • 1.25″ Focuser Adaptor
  • 8×50 Finderscope with Bracket
  • Eyepiece – 5mm, 20mm
  • Tube Ring Attachment to Any Sky-Watcher Mount
  • Piggyback Bracket

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