PlaneWave CDK20 Telescope

Starting Price: $34,000.00
Price as Configured: $34,000.00
Brand: PlaneWave Instruments / SKU: PW-200104Q
PlaneWave manufactures your telescope of choice for unsurpassed astroimaging, research, or satellite tracking. Here are the basics of the PlaneWave CDK20:
  • f/6.8 and 3454mm focal length.
  • Also available with f/7.77 and 3951 mm focal length. There is an additional 1.79" of backfocus and 497 mm of focal length compared to the standard CDK20 f/6.8 model.
  • No coma, no off-axis astigmatism, and no field curvature.
  • Pinpoint stars across a 52mm image circle.
  • Rock solid fused silica mirrors with low thermal expansion.
  • Carbon fiber optical tube assembly for rigidity and fast cooling.
  • Simple secondary mirror collimation thanks to the fixed primary mirror.

NOTE: Shipping cost will be determined after the order is made and must be paid before the telescope will ship. A shipping quote can be obtained on request.
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Recommended Add-ons and Accessories

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PW-200150 - PlaneWave Counterweight Accessory for CDK14 & 20
PW-200150 - PlaneWave Counterweight Accessory for CDK14 & 20
$230.00
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PW-200150 - PlaneWave Counterweight Accessory for CDK14 & 20
About This Product
Counterweights and bracket for CDK14 and CDK20 (front ring only). Comes with three 0.5lb stackable weights (PW-125382).

PW-2002010 - PlaneWave CDK20 F/7.77 Corrector Lens Assembly
PW-2002010 - PlaneWave CDK20 F/7.77 Corrector Lens Assembly
$1,400.00
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PW-2002010 - PlaneWave CDK20 F/7.77 Corrector Lens Assembly
About This Product

This is lens group is designed to convert a CDK20 f/6.8 to f/7.77. The original lens group is unscrewed from the backplate of the optical tube and replaced with the new lens group.

  • Adds 1.9″ of backfocus to the optical tube for those requiring additional imaging train components.
  • Increases focal length to 3951mm, which is an additional 497 mm of focal length compared to the standard CDK20 f/6.8.
PW-200204 - PlaneWave CDK20 F/6.8 Corrector Lens Assembly
PW-200204 - PlaneWave CDK20 F/6.8 Corrector Lens Assembly
$1,400.00
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PW-200204 - PlaneWave CDK20 F/6.8 Corrector Lens Assembly
About This Product
CDK20 F/6.8 CORRECTOR Lens Assembly, FOR CHANGING F/7.77 CDK20 TO WIDER-FIELD F/6.8 SYSTEM
PW-200166 - PlaneWave Reducer 0.66X CDK20/24
PW-200166 - PlaneWave Reducer 0.66X CDK20/24
$1,400.00
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PW-200166 - PlaneWave Reducer 0.66X CDK20/24
About This Product

This is a reducer designed specifically for flat field telescopes like the CDK. This reduces the f ratio of the CDK telescope 66%. The f/6.8  CDK20 telescopes will be reduced to about f/4.5.

**NOTE – 200166 adapter is also compatible with CDK17 that have 8.81″ back focus.   CDK17 with 10.24″ back focus will use the 125166 focal reducer. See instruction manual for details.

PW-200915 - PlaneWave Ronchi Eyepiece and Adapter Kit for CDK20 + CDK24
PW-200915 - PlaneWave Ronchi Eyepiece and Adapter Kit for CDK20 + CDK24
$400.00
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PW-200915 - PlaneWave Ronchi Eyepiece and Adapter Kit for CDK20 + CDK24
About This Product
RONCHI EYEPIECE and ADAPTER KIT FOR CDK20 + CDK24 (CDK24 REQUIRES 240343-1 FOR PROPER USE AT 8.81" BACKFOCUS) INCLUDES: CDK BACKPLATE ADAPTER, RONCHI EYEPIECE, and RONCHI EYEPIECE SPACERS (CDK20/CDK24 SPECIFIC SPACER + CDK14-CDK24 STandARD SPACER)
PW-200970-KIT - PlaneWave CDK20 Spandex Shroud and Spacer SET
PW-200970-KIT - PlaneWave CDK20 Spandex Shroud and Spacer SET
$650.00
PW-200970 - PlaneWave CDK20 Upper Cage Light Shroud
PW-200970 - PlaneWave CDK20 Upper Cage Light Shroud
$150.00
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PW-200970 - PlaneWave CDK20 Upper Cage Light Shroud
About This Product
This is a spandex fabric light shroud that blocks out stray light and minimizes dust on the primary mirror.
PW-2003136 - PlaneWave Solid Aluminum Shroud CDK20 (Factory Installation Required)
PW-2003136 - PlaneWave Solid Aluminum Shroud CDK20 (Factory Installation Required)
$800.00
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PW-2003136 - PlaneWave Solid Aluminum Shroud CDK20 (Factory Installation Required)
About This Product
NOTE: Shipping cost will be determined after the order is made and must be paid for before the item will ship. A shipping quote can be obtained on request.
PW-2002101 - PlaneWave Sliding Counterweight System Rail & Brackets for CDK20
PW-2002101 - PlaneWave Sliding Counterweight System Rail & Brackets for CDK20
$600.00
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PW-2002101 - PlaneWave Sliding Counterweight System Rail & Brackets for CDK20
About This Product
Requires sliding weight system counterweights, not included.
PW-200398 - PlaneWave Counterweight Bracket for CDK14 (Front-Ring Only) & CDK20
PW-200398 - PlaneWave Counterweight Bracket for CDK14 (Front-Ring Only) & CDK20
$70.00
PW-600166 - PlaneWave Reducer, Lens .66x for IRF90 & CDK20/24
PW-600166 - PlaneWave Reducer, Lens .66x for IRF90 & CDK20/24
$1,400.00
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Price as Configured: $34,000.00

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Optical System

Optical Design Corrected Dall-Kirkham (CDK)
Aperture 20 inch (508 mm)
Focal Length 3454 mm (135.98 inch) for f/6.8
3951 mm (155.55 inch) for f/7.77
Focal ratio f/6.8 or f/7.77
Central Obstruction 39% of the primary mirror diameter
Back Focus from Mounting Surface 8.81 inch (224 mm) for the f/6.8
10.61 inch (269.49 mm) for the f/7.77
Weight 140 lbs (63.5 kg)
OTA Length 47 inch (1,194 mm)


Upper Cage Carbon fiber truss
Lower Cage Carbon fiber truss and light shroud
Optimal Field of View 52mm image circle

Secondary Mirror

Diameter 191 mm (7.5 inch)
Material Fused silica (quartz)
Shape Spherical
Coating Enhanced aluminum – 96%

Primary Mirror

Optical Diameter 20 inches (508 mm)
Outer Diameter 20.5 inches (521 mm)
Shape Prolate ellipsoid
Material Fused silica (quartz)
Coating Enhanced aluminum – 96%

Lens Group

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

Standard Features

CDK Optics The Corrected Dall-Kirkham design yields a perfectly flat field free from off-axis astigmatism, coma and defocus.
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 fans blow air inside the back of the telescope. 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.
Delta-T Ready 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.

Shipping

Crated Shipping Weight 291 lbs (130 kgs)
Crate Width 33 inches (838 mm)
Crate Height 33 inches (838 mm)
Crate Length 65 inches (1651 mm)

Includes Accessories

Primary Mirror Cover To protect the primary mirror
PlaneWave Thumb Drive Contains software and instructions for collimation and spacing the primary to secondary mirror
12VDC Power Supply Provides power for the fans