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PlaneWave Instruments CDK20 Optical Tube Assembly
PlaneWave Instruments CDK20 Optical Tube Assembly Weave/Design

PlaneWave Instruments CDK20 Optical Tube Assembly

Product Number: PW-CDK20

Manufacturer: PlaneWave Instruments
The PlaneWave Instruments CDK20 is a 20-inch (0.51 m) 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 (64 kg) and comes standard with a back plate retaining ring ready to accept the focuser of your choice.
Price: $32,500.00


Aperture 20 inch (508 mm)
Focal Length 3454 mm (135.98 inch)
Focal ratio F/6.8
Central Obstruction 39% of the Primary Mirror Diameter
Back Focus from Racked in Focuser 5.8 inch (147 mm)
Weight 140 lbs (63.5 kg)
OTA Length 47 inch (1,194 mm)
Upper Cage Carbon Fiber Truss
Lower Cage Carbon Fiber Truss with Carbon Fiber Light Shroud


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 Enhanced Aluminum - 96%


Diameter 7.5 inch (191mm)
Material Precision Annealed Borosilicate
Shape Spherical
Coating Enhanced Aluminum - 96%


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

Crated Shipping Weight 291 lbs   (132.0 kg)
Crate Width 32 inch   (813 mm)
Crate Height 36 inch   (914 mm)
Crate Length 59 inch   (1,499 mm)
Ronchi Spacer (200354) This spacer sits in place of a focuser and is used for setting the primary to secondary spacing. It has an 1 .25”  inner diameter and may be used with 1.25” oculars for collimation.
Ronchi Ocular This ocular is a Ronchi screen used for setting the primary to secondary spacing.
Primary Mirror Cover  The Primary Mirror Cover protects the primary mirror.
Printed Instructions  For Collimation and Spacing
12VDC Power Supply (18778)  Provides power for the fans (Not included for European Orders)
Wrench Set (5812A35 )  English Hex Wrenches (European Orders Only)

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