PlaneWave CDK20 Optical Tube Assembly (f/6.8)

Starting Price: $34,000.00
Price as Configured: $34,000.00
Brand: PlaneWave Instruments / SKU: PW-200104Q
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.

NOTE: Shipping cost will be determined after the order is made and must be paid for before the telescope will ship. A shipping quote can be obtained on request.
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Recommended Add-ons and Accessories
Product Price Quantity
PW-6009003 - PlaneWave FINDER SCOPE AND MOUNTING BRACKET
PW-6009003 - PlaneWave FINDER SCOPE AND MOUNTING BRACKET
About This Product
The finder mounting plate attaches to the back plate of the telescope and the quick-release finder bracket attaches to the mounting plate. If the telescope used in on a German Equatorial Mount, it may be convenient to purchase two finder scopes - one for the east and one for the west side of the telescope. The finder scope is a Baader 10x60 Varios with mounting rings and L-bracket. The back plate of all of the PlaneWave CDK models has four mounting positions for a finder mounting plate.
$460.00 each
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PW-6009003 - PlaneWave FINDER SCOPE AND MOUNTING BRACKET
PW-6009003 - PlaneWave FINDER SCOPE AND MOUNTING BRACKET
$460.00
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PW-6009003 - PlaneWave FINDER SCOPE AND MOUNTING BRACKET
About This Product
The finder mounting plate attaches to the back plate of the telescope and the quick-release finder bracket attaches to the mounting plate. If the telescope used in on a German Equatorial Mount, it may be convenient to purchase two finder scopes - one for the east and one for the west side of the telescope. The finder scope is a Baader 10x60 Varios with mounting rings and L-bracket. The back plate of all of the PlaneWave CDK models has four mounting positions for a finder mounting plate.
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 USE WITH IRF90 & CDK20/24
PW-600166 - PlaneWave REDUCER, LENS .66x FOR USE WITH IRF90 & CDK20/24
$1,400.00
QTY:  
Price as Configured: $34,000.00

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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.

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 fans blow air inside the back of the telescope. Internal diverting fins circulate air flow behind the mirror for even cooling to help the telescope reach thermal equilibrium quickly. The fans are controlled with PWI PC software with the optional Electronic Focus Accessory (EFA Kit).