PlaneWave CDK17 Fused Silica

Brand: Planewave
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Brand: Planewave
SKU: 171101Q
$41,999.00

– Price shown includes GST
– GST is removed at checkout for NZ

Not currently in stock. You can backorder now, but product will be delayed by two weeks or more due to global logistics.

For better availability information call 02 9518 7255 or email sales@bintel.com.au

QUANTITY

The PlaneWave  CDK 17 Fused Silica is a 17 inch (0.43 m) f/6.8 Corrected Dall-Kirkham Astrograph telescope. The CDK17 has a dual carbon-fiber truss design, with 3 cooling fans ejecting air from the back of the telescope, and 4 fans blowing across the boundary layer of the mirror’s surface. The CDK17 covers a 70 mm field of view without any field curvature, off-axis coma, or astigmatism. The instrument weight is 94 lbs (43 kg) and comes standard with a back plate retaining ring ready to accept the focuser of your choice.

SKU: 170101Q        PlaneWave Fused Silica

The CDK (Corrected Dall-Kirkham) Optical Design is an innovative solution for unsurpassed astroimaging 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 center to the corner of the field of view.
More about our Optical Design

PlaneWave  CDK 17 Fused Silica Features:

Carbon Fiber Truss DesignOpen truss tube design with carbon fiber frame minimizes thermal expansion which causes focus shift with changes in temperature. Carbon fiber truss design also promotes quick thermal cooling and provides a rigid, lightweight structure.
3D Printed BafflesPlanewave 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 minimize vignetting and maximize image contrast.
Dovetail Expansion JointAllows for the difference in thermal expansion between carbon fiber and aluminium. The expansion joint allows the aluminium dovetail expand and contract without stressing the carbon fiber lower truss.
Cooling FansThree 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.

OPTICAL SYSTEM

Optical DesignCorrected Dall-Kirkham
Aperture17 inch (432 mm)
Focal Length2939 mm (115.71 inch)
Focal ratioF/6.8
Central Obstruction23.7% by surface area; 48.6% of the Primary Mirror Diameter
Back Focus from Mounting Surface10.24 inch (260 mm)
Back Focus from Racked in Focuser7.24 inch (184 mm)
Weight106 lbs (48 kg)
OTA Length42 inch (1067 mm)
Optical Performance6.5 micron rms at 21mm and 9.6 micron at 26mm off-axis
Upper CageCarbon Fiber Truss
Lower CageCarbon Fiber Truss with Carbon Fiber Light Shroud
Optimal Field of View70mm Image Circle

SECONDARY MIRROR

Diameter190 mm (7.48 inch)
MaterialPrecision Annealed Pyrex
ShapeSpherical
CoatingEnhanced Aluminium – 96%

PRIMARY MIRROR

Optical Diameter17 inch (432 mm)
Outer Diameter17.5 inch (445 mm)
ShapeProlate Ellipsoid
MaterialPrecision Annealed Borosilicate or Fused Silica
CoatingEnhanced Aluminium – 96%

LENS GROUP

Diameter105 mm (4.13 inch)
Number of lenses2
CoatingBroadband AR Coatings (less than .5% reflected from 400 to 700nm)

STANDARD FEATURES

Carbon Fiber Truss DesignMinimizes thermal expansion which causes focus shift with changes in temperature
Dovetail Expansion JointAllows for the difference in thermal expansion between carbon fiber and aluminium. The expansion joint allows the aluminium dovetail expand and contract without stressing the carbon fiber lower truss
Cooling FansThree 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.

SHIPPING

Crated Shipping Weight225 lbs   (102.1 kg)
Crate Width30 inch   (762 mm)
Crate Height37 inch   (940 mm)
Crate Length58 inch   (1,473 mm)

INCLUDED ACCESSORIES

Ronchi Spacer (600341 & 600343)This spacer sits in place of a focuser and is used for setting the primary to secondary spacing. It has an 1-1/4 inner diameter and may be used with 1-1/4 oculars for collimation
Ronchi OcularThis ocular is a Ronchi screen used for setting the primary to secondary spacing
Primary Mirror CoverThe Primary Mirror Cover protects the primary mirror
Planewave Thumb DriveContaining all documentation and software for collimation and spacing

NOTE: Leadtime on this telescope is considerable. For more details email      Education@bintel.com.au

PlaneWave CDK17 Fused Silica

SKU: 171101Q
  • The PlaneWave Instruments CDK17 is a 17 inch (0.43 m) f/6.8 Corrected Dall-Kirkham Astrograph telescope.
  • Fused Silica Substrate for better Thermal Equilibrium
  • The CDK 17 covers a 70 mm field of view without any field curvature, off-axis coma, or astigmatism.
  •  The instrument weight is 43 kg. (94 lbs)

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