PlaneWave 17 inch Dall-Kirkham Optical Tube Assembly

PlaneWave 17 inch Dall-Kirkham Optical Tube Assembly
  • $24,000.00


This is a Dall-Kirkham optical design with coatings that are optimized to transmit in infrared or ultra violet wavelengths. It is diffraction limited across a 20mm image circle at the focal plane. There are no refractive lens, only reflective components to the design. For IR application, reflectives coatings are a protected gold which give better than 98% reflectivity from .65 micron (650nm) to 5 micron (5000nm). This design is ideal for infrared astronomy or LIDAR applications. UV optimized coatings can also be used at an additional cost.

Recommended Configuration

CDK17 with Ascension 200HR Mount

DK17 Optical Tube (170101)
Ascension 200HR German Equatorial Mount (A200110)
3 Counterweights, 40 lbs each, 1.875" shaft (600111)
Dovetail Clamp (200919)
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 106 lbs (48.1 kg)
Upper Cage Carbon Fiber Truss
Lower Cage Carbon Fiber Truss with Carbon Fiber Light Shroud
Overall Dimensions 39.5 inch (1003mm) long X 21.5 inch (546mm) wide X 24.5 inch (622mm) high
PlaneWave Primary Mirror
Diameter 17.75 inch (446 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 IR or UV optimized
PlaneWave Secondary Mirror
Diameter 6.25 inch (159 mm)
Material Precision Annealed Pyrex
Shape Spherical
Coating IR or UV optimized
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.
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
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)