PlaneWave 24 Inch Ritchey-Chrétien Optical Tube Assembly

PlaneWave 24 Inch Ritchey-Chrétien Optical Tube Assembly
  • $65,000.00


f/6.5 Ritchey-Chrétien (RC) Astrograph telescope. The PW24-RC has a dual truss design, with 3 cooling fans for the back of the primary mirror and 4 fans for the front surface of the primary mirror. The instrument weight is 240 lbs (109 kg) and comes standard with a back plate retaining ring ready to accept the focuser of your choice.

In certain applications such as photometry and spectroscopy, refractive lenses could influence scientific results. The PW24-RC in its native format (no field flattening lenses) uses only a primary and secondary mirror with reflective coatings. This can be useful when making observations primarily on-axis and wide field imaging is not a concern.

Corrected Dall-Kirkham / Ritchey-Chrétien Optics Comparison

Recommended Configuration

PW24-RC with Ascension 200HR Mount

PW24-RC Optical Tube (240101)
Ascension 200HR German Equatorial Mount (A200110)
7 Counterweights, 40 lbs each, 1.875" shaft (600111)
8" Counterweight Extension Shaft (A200-142)
Dovetail Clamp (200919)
Total Price
PlaneWave System
Aperture 24 inch (610 mm)
Focal Length 3962 mm (155.98 inch)
Focal Ratio f/6.5
Central Obstruction 41% of the Primary Mirror Diameter
Back Focus from Mounting Surface 14.1 inch (358 mm)
Back Focus from Racked in Focuser 5.81 inch (148 mm)
Weight 240 lbs (108.9 kg)
Upper Cage Carbon Fiber Truss
Lower Cage Carbon Fiber Truss with Aluminum Light Shroud
Optimal Field of View 70 mm (58 arcminute)
Overall Dimensions 56 inch (1,422 mm) long X 31 inch (787 mm) wide X 35 inch (889 mm) high
PlaneWave Primary Mirror
Diameter 24.5 inch (622 mm)
Aperture 24 inch (610 mm)
Focal Ratio f/3.2
Mounting Laser Collimated and Permanently Fixed
Material Precision Annealed Borosilicate
Shape Hyperbolic
Coating Enhanced Aluminum - 96%
PlaneWave Secondary Mirror
Diameter 9.45 inch (240 mm)
Material Precision Annealed Borosilicate
Shape Hyperbolic
Coating Enhanced Aluminum - 96%
PlaneWave Standard Features
Design Carbon fiber truss design that minimizes thermal expansion which causes focus shift with changes in temperature.
Light Shroud 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. The expansion joint allows the aluminum dovetail expand and contract 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 The CDK24 has two different cooling schemes. First there are three fans behind the primary mirror that blow air out of the optical tube pulling air though the telescope and by the primary mirror. This helps the telescope to equilibrate quickly. The second scheme is that there are 8 fans placed around the face of the primary mirror to equilibrate the face of the mirror and to keep a laminar air flow above the telescope’s light path. The two schemes can be controlled separately with the included switches on the optical tube or can be controlled by a computer if the optional Electronic Focus Accessory (EFA Kit) is purchased.
PlaneWave Shipping
Crated Shipping Weight 500 lbs (226.8 kg)
Crate Dimensions 40 inch (1,016 mm) wide X 48 inch (1,219 mm) high X 78 inch (1,981 mm) long
PlaneWave Included Accessories
Focuser Adapter This 5.3" long spacer may be installed between the backplate and the focuser to take up some of the CDK24's extra backfocus and reduce the torque placed on the focuser mechanism. This spacer is sized such that the backfocus distance behind the focuser will match that of the CDK20.
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 Includes instructions for Collimation and Spacing and software.
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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