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Planewave CDK 17 Optical Tube Assembly
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 Planewave CDK 17 Optical Tube AssemblyPlanewave CDK 17 Optical Tube Assembly 

Planewave CDK 17 Optical Tube Assembly

£27,000.00✓ 2 year warranty

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Usually shipped 30-40 working days.

About this product

Model:  planewave_cdk17

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.

SPECIFICATIONS

OPTICAL SYSTEM

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

SECONDARY MIRROR

Diameter 190 mm (7.48 inch)
Material Precision Annealed Pyrex
Shape Spherical
Coating Enhanced Aluminium – 96%

PRIMARY MIRROR

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%

LENS GROUP

Diameter 105 mm (4.13 inch)
Number of lenses 2
Coating Broadband AR Coatings (less than .5% reflected from 400 to 700nm)

STANDARD FEATURES

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

Ronchi Spacer
Ronchi Ocular
Primary Mirror Cover
Planewave Thumb Drive
12v DC Power Supply

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