SkyWatcher 100/900 Black Diamond ED Doublet Refractor Telescope
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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 of build||Apochromat Doublet|
|Focal length (mm)||900|
|Limit value (mag)||11,8|
|Light gathering capacity||204|
|Max. useful magnification||200|
|Tube weight (kg)||3,5|
|Type of build||Crayford|
|Connection ( to eyepiece)||2|
|Gear reduction||1:10 Fine movement|
|Mounting type||no mount|
|Type of build||OTA|
|2'' eyepieces||LET Okular 28mm|
|Deviating optics||2", 90° star diagonal|
Area of application
|Moon & Planets||yes|
|Nebulae & galaxies||no|
|Sun||not recommended (Only with appropriate Sun filter)|
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