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PlaneWave - 20" CDK20 Corrected Dall-Kirkham Carbon Fiber Truss Telescope

Model#: 200101

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$32,500.00

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Manufactured by: PlaneWave Instruments

PlaneWave 20" CDK Corrected Dall-Kirkham Carbon Fiber Truss Telescope

Details

PlaneWave 20" CDK Corrected Dall-Kirkham Carbon Fiber Truss Telescope

 

The new CDK optical design is the innovative solution for unsurpassed astroimaging quality at an affordable price. The purpose of the design is to provide a telescope that will excel at 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-Chretien design. The RMS spot sizes at the edge of a 35mm frame remain smaller than a single pixel on the most advanced CCD cameras available to amateurs today.

This no-compromise design is unique in making the optical alignment very forgiving and collimation very easy. This guarantees the user will be sure to get the best performance out of the telescope possible. 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), all the way out to a 42mm image circle. All this means, the stars will be pinpoints from the center of the field of view out to the corner of the field of view.

STANDARD FEATURES 

Carbon Fiber Truss Design Minimizes thermal expansion which causes focus shift with changes in temperature
Dovetail expansion joint Allows for the difference in thermal expansion between carbon fiber and aluminum. The expansion joint allows the aluminum dovetail expand and contract without stressing the carbon fiber lower truss
Cooling Fans Three cooling fan blow out of the optical tube pulling air though the telescope and pass the primary mirror. This helps the telescope to reach thermal equilibrium quickly. The fans are conrolled by a computer if the optional Electronic Focus Accessory (EFA Kit) is purchased.

 

PRIMARY MIRROR

Diameter 20.5 inch (521 mm)
Aperture 20 inch (508 mm)
Focal ratio f/3
Mounting Laser Collimated and Permanently Fixed
Material Precision Annealed Pyrex
Shape Prolate Ellipsoid
Coating Broadband AR Coatings (less than .5% reflected from 400 to 700nm)

 

SECONDARY MIRROR

Diameter 7.5 inch (191mm)
Material Precision Annealed Borosilicate
Shape Spherical
Coating

Broadband AR Coatings (less than .5% reflected from 400 to 700nm)

LENS GROUP

Diameter 90 mm (3.54 inch)
Number of lenses 2
Coating Broadband AR Coatings (less than .5% reflected from 400 to 700nm)

 

 

 

 

 

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Product Series

The CDK telescope is a brand new optical design invented by Dave Rowe. The goal of the design is to make an affordable astrographic telescope with a large enough imaging plane to take advantage of the large format CCD cameras of today. Most telescope images degrade as you move off-axis from either coma, off-axis astigmatism, or field curvature. The CDK design suffers from none of these problems. The CDK is coma free, has no off-axis astigmatism, and has a flat field. The design is a simple and elegant solution to the problems posed above. The CDK consists of three components: an ellipsoidal primary mirror, a spherical secondary mirror and a lens group. All these components are optimized to work in concert in order to create superb pinpoint stars across the entire 42mm image plane.

Additional Information

Name PlaneWave - 20" CDK20 Corrected Dall-Kirkham Carbon Fiber Truss Telescope
Manufacturer PlaneWave Instruments
Model 200101
Aperture 20 inch (508 mm)
Focal Length 3454 mm (135.98 inch)
Focal Ratio F/6.8