About this product
The CDK17 is an innovative solution for unsurpassed astro imaging quality at an affordable price. The CDK telescope design provides excellent imaging with large format CCD cameras while remaining superb for visual use. The CDK design far exceeds the off-axis performance of most commercial telescope designs including the Ritchey-Chrétien design.
This no-compromise design is unique in making the optical alignment forgiving and collimation very easy. This guarantees the user the best possible performance from the telescope. The end result at the image plane of the CDK design is no off-axis coma, no off-axis astigmatism, perfectly flat field (no off-axis defocus). The CDK design will give you pinpoint stars from the centre to the corner of the field of view.
The CDK 17 features an Open truss tube design with carbon fibre frame minimises thermal expansion which causes focus shift with changes in temperature. Carbon fibre truss design also promotes quick thermal cooling and provides a rigid, lightweight structure.
Planewave uses digital 3D printing technology to produce lightweight baffle tubes. 3D printers add successive layers of material to construct a baffle system with precision positioned internal stray light baffles to minimise vignetting and maximise image contrast.
The Dovetail Expansion Joint allows for the difference in thermal expansion between carbon fibre and aluminium. The expansion joint allows the aluminium dovetail to expand and contract without stressing the carbon fibre lower truss.
For added dew prevention, the CDK14 is internally wired with polyimide film heater pads and temperature sensor, ready to be controlled with the optional Delta T Controller.
Price includes 1323517 Shipping and Storage Crate
|Optical Design ||Corrected Dall-Kirkham |
|Aperture ||17 inch (432 mm) |
|Focal Length ||2939 mm (115.71 inch) |
|Focal ratio ||F/6.8 |
|Central Obstruction ||23.7% by surface area; 48.6% of the Primary Mirror Diameter |
|Back Focus from Mounting Surface ||10.24 inch (260 mm) |
|Back Focus from Racked in Focuser ||7.24 inch (184 mm) |
|Weight ||106 lbs (48 kg) |
|OTA Length ||42 inch (1067 mm) |
|Optical Performance ||6.5 micron rms at 21mm and 9.6 micron at 26mm off-axis |
|Upper Cage ||Carbon Fibre Truss |
|Lower Cage ||Carbon Fibre Truss with Carbon Fibre Light Shroud |
|Optimal Field of View ||70mm Image Circle |
|Diameter ||190 mm (7.48 inch) |
|Material ||Precision Annealed Pyrex |
|Shape ||Spherical |
|Coating ||Enhanced Aluminium – 96% |
|Optical Diameter ||17 inch (432 mm) |
|Outer Diameter ||17.5 inch (445 mm) |
|Shape ||Prolate Ellipsoid |
|Material ||Precision Annealed Borosilicate or Fused Silica |
|Coating ||Enhanced Aluminium – 96% |
|Diameter ||105 mm (4.13 inch) |
|Number of lenses ||2 |
|Coating ||Broadband AR Coatings (less than .5% reflected from 400 to 700nm) |
|Carbon Fibre Truss Design ||Minimises thermal expansion which causes focus shift with changes in temperature |
|Dovetail Expansion Joint ||Allows for the difference in thermal expansion between carbon fibre and aluminium. The expansion joint allows the aluminium dovetail expand and contract without stressing the carbon fibre lower truss |
|Cooling Fans ||Three cooling fans ejecting air from the back of the telescope and four fans blowing across the boundary layer of the mirror surface. This helps the telescope to reach thermal equilibrium quickly. The fans are controlled by a computer if the optional Electronic Focus Accessory (EFA Kit) is purchased. |
What's in the box
Primary Mirror Cover
Planewave Thumb Drive
12v DC Power Supply
|Average Rating (1 Review): |
Sunday, 14 February 2021 | John
I'm sure it's great, but I wouldn't say it's affordable for 99% of people, so why lead with that?
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