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  • PlaneWave astrografo CDK12.5 f/8 con ottiche in silicio fuso PlaneWave astrografo CDK12.5 f/8 con ottiche in silicio fuso

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for order at least €250

PlaneWave CDK20 astrograph f/6.8 with fused silica optics

Product code: 1323220Q

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Quick Overview

The PlaneWave Instruments CDK20 is a 20 inch (508mm) f/6.8 Corrected Dall-Kirkham Astrograph telescope. The CDK20 has a dual carbon-fiber truss design, with 3 cooling fans ejecting air from the back of the telescope. The CDK20 covers a 52 mm field of view without any field curvature, off-axis coma, or astigmatism. The instrument weight is 140 lbs (63,5 kg) and comes standard with a back plate retaining ring ready to accept the focuser of your choice. 

For optional accessories (0,66x reducer, Delta T controller, Hedrick focuser, EFA electronic focuser) and telescope availability and delivery time, please contact us.

Availability: Order

Order €39,900.00
22% tax incl


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.

PlaneWave CDK20 astrograph f/6.8 with fused silica optics

PlaneWave CDK20 astrograph f/6.8 with fused silica optics: main features

Carbon Fiber Truss Design: open 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.

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 fans blow out of the optical tube pulling air though the telescope and by the primary mirror. This helps the telescope to reach thermal equilibrium quickly. The fans are controlled by a switch on the optical tube or can be controlled by a computer if the optional Electronic Focus Accessory (EFA Kit) is purchased.

Delta-T Ready: for added dew prevention, the CDK20 is internally wired with polyimide film heater pads and temperature sensor, ready to be controlled with the optional Delta-T controller.

Technical specifications

Optical Design Modified Dall-Kirkham
Optics Primario ellittico, secondario sferico, con correttore
Diameter (mm) 508mm
Tube diameter N/A
Focal Length (mm) 3454mm
Focal Ratio 6.8
Field flattener/corrector Included and not removable
Optical Tube Carbonio
Obstruction 48.5%
Focuser Opzionale
Eyepiece holder No
Weight 63,5 kg
Hard/soft case No

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