PlaneWave 17 inch CDK Optical Tube Assembly

PlaneWave 17 inch CDK Optical Tube Assembly
  • $22,000.00

 


The PlaneWave Instruments CDK17 is a 17 inch (0.43 m) f/6.8 Corrected Dall-Kirkham Astrograph telescope. The CDK17 has a dual carbon-fiber truss design, with 3 cooling fans ejecting air from the back of the telescope. The CDK24 covers a 52 mm field of view without any field curvature, off-axis coma, or astigmatism. The instrument weight is 94 lbs (43 kg) and comes standard with the large capacity 3.5 inch Hedrick focuser

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.

Recommended Configuration

CDK17 with Ascension 200HR Mount

$22,000
CDK17 Optical Tube (170101)
$23,500
Ascension 200HR German Equatorial Mount (A200110)
$1,200
3 Counterweights, 40 lbs each, 1.875" shaft (600111)
n/c
Dovetail Clamp (200919)
$46,700
Total Price
 
PlaneWave System
Aperture 17 inch (432 mm)
Focal Length 2939 mm (115.71 inch)
Focal Ratio f/6.8
Central Obstruction 39% of the Primary Mirror Diameter
Back Focus from Mounting Surface 8.8 inch (224 mm)
Back Focus from Racked in Focuser 5.8 inch (147 mm)
Weight 94 lbs (42.6 kg)
Upper Cage Carbon Fiber Truss
Lower Cage Carbon Fiber Truss with Carbon Fiber Light Shroud
Optical Performance 14.4mm off-axis: 4 micron RMS spot size; 21mm off-axis: 6.5 micron RMS spot size; 26mm off-axis: 9.6 micron RMS spot size
Overall Dimensions 39.5 inch (1003mm) long X 21.5 inch (546mm) wide X 24.5 inch (622mm) high
PlaneWave Primary Mirror
Diameter 17.5 inch (445 mm)
Aperture 17 inch (432 mm)
Focal Ratio f/2.6
Mounting Laser Collimated and Permanently Fixed
Material Precision Annealed Pyrex
Shape Prolate Ellipsoid
Coating Enhanced Aluminum - 96%
PlaneWave Secondary Mirror
Diameter 6.25 inch (159 mm)
Material Precision Annealed Pyrex
Shape Spherical
Coating Enhanced Aluminum - 96%
PlaneWave Lens Group
Diameter 90 mm (3.54 inch)
Number of Lenses 2
Coating Broadband AR Coatings (less than .5% reflected from 400 to 700nm)
PlaneWave Standard Features
Design Carbon fiber truss design that minimizes thermal expansion which causes focus shift with changes in temperature
Dovetail The massive PlaneWave dovetail supports the optical tube to provide rigidity. A matching dovetail clamp is available to install on various mounts.
Light Shroud Carbon fiber lower light shroud that protects the primary mirror from damage and stray light
Dovetail Expansion Allows for the difference in thermal expansion between carbon fiber and aluminum without stressing the carbon fiber lower truss.
Hedrick Focuser 3.5 inch Hedrick heavy duty no-slip focuser. The focus tube runs on 5 bearings and is driven by a leadscrew so there is no chance of slipping. It accepts an optional dial indicator and PlaneWave’s EFA Kit to control many electronic accessories. The draw tube travel is 1.3 inch.
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 conrolled by a computer if the optional Electronic Focus Accessory (EFA Kit) is purchased.
PlaneWave Shipping
Crated Shipping Weight 225 lbs (102.1 kg)
Crate Dimensions 29 inch (737 mm) wide X 33 inch (838 mm) high X 45 inch (1,143 mm) long
PlaneWave Included Accessories
Focuser Adapter 3.5" to 2" Adapter (200349). Adapts the 3.5" inner diameter of the focuser to a standard 2" inner diameter. This adapter is necessary when setting the primary to secondary spacing. The 200399 Visual 3.5" to 2" adapter is an optional accessory that is designed to space a 2" diagonal for visual use.
Ronchi Spacer (200354) This spacer is used for setting the primary to secondary spacing. It has an 1-1/4 inner diameter and may be used with 1-1/4 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.
PlaneWave Thumb Drive 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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