Skip to main content

CDK24 Optical Tube Assembly

SKU# 240104Q

Price: $63,500.00


The CDK24 is an innovative telescope for unsurpassed astroimaging, research, or satellite tracking.

  • f/6.5 and 3974mm focal length.
  • No coma, no off-axis astigmatism, and no field curvature.
  • Pinpoint stars across a 70mm 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.
  • Bright, crisp, views for visual observing and star parties.


Capturing the most stunning astrophotographs possible is something our team is passionate about. From design to manufacture, our goal with the Corrected Dall-Kirkham (CDK) 24″ telescope was centered around performance and ease of use. The CDK24 is an incredible breakthrough in telescope technology and produces no off-axis coma and no off-axis astigmatism. Additionally, the CDK24 provides a perfectly flat field so your astrophotographs will have stunning clarity from corner to corner of the image without field curvature degrading the photos. Offering the simplicity of single-mirror collimation, the stray light control of advanced baffles, structural performance created through finite element analysis (FEA), and decades of telescope design experience, the CDK24 is an exceptional diffraction-limited telescope. CDK24 users can experience pinpoint stars edge-to-edge and a 45 x 45 arcminute field of view when using large 16803 size camera sensors. When equipment fades into the background and simply performs, the astrophotography experience becomes even more fun and rewarding!

Checkout more about our technology and optical design here.

CDK24 Features

Fused Silica Optics


Fused silica (quartz) has a coefficient of thermal expansion six times lower than Borosilicate (Pyrex) glass, which means that as it cools down, fused silica preserves its shape to a high degree of accuracy. This translates into consistent optical performance and unchanging focus as temperature changes.

Delta-T Ready


For added dew prevention, the CDK24 is internally wired with polyimide film heater pads and temperature sensor, which is ready to be controlled with the Delta-T via PlaneWave Interface 3 software.

Carbon Fiber Truss Design


Minimizes thermal expansion which causes focus shift as temperature changes during an imaging session. Carbon fiber also reaches ambient temperatures quickly and is extremely lightweight and rigid to help ensure excellent imaging data is produced.

3D Printed Baffles


PlaneWave uses digital 3D printing technology to produce lightweight baffle tubes. 3D printers add successive layers of material to construct a baffle system with precision positioned internal stray light baffles to minimize vignetting and maximize image contrast. Quality baffling makes an incredible difference in overall image quality, so we ensured an optimal design was created for our telescopes.

Dovetail expansion joint


Allows for the difference in thermal expansion between carbon fiber and aluminum. The expansion joint allows the aluminum dovetail to expand and contract without stressing the carbon fiber lower truss. This results in images that are not distorted due to expansion, or contraction of the optical tube materials.

Cooling Fans


Three fans on the backplate of the optical tube pull air through the telescope and by the primary mirror. Three fans on the side of the optical tube also blow air across the primary to ensure a boundary layer of air does not distort images. These fans help the telescope reach thermal equilibrium quickly, further reducing any distortion in images due to temperature variations. The fans are controlled by a switch on the optical tube, or can be controlled by via PWI3 software if a PlaneWave Electronic Focus Accessory (EFA Kit) is purchased.



Optical System

Aperture24 inch (610 mm)
Focal Length3974 mm (156.46 inch)
Focal ratioF/6.5
Central Obstruction47% of the primary mirror diameter
Back Focus from Mounting Surface14.349 inch (364.46 mm)
Weight240 lbs (108.9 kg)
OTA Length56 inch (1,422 mm)
Upper CageCarbon fiber truss
Lower CageCarbon fiber truss with aluminum light shroud
OTA Width31 inch (787 mm)
OTA Height35 inch (889 mm)
Optimal Field of View70 mm image circle

Secondary Mirror

Diameter11 inch (280 mm)
MaterialFused silica (quartz)
CoatingEnhanced aluminum – 96%

Primary Mirror

Optical Diameter24 inch (610 mm)
Outer Diameter24.5 inch (622 mm)
ShapeProlate Ellipsoid
MaterialFused silica (quartz)
CoatingEnhanced aluminum – 96%

Lens Group

Diameter135 mm (5.31 inch)
Number of lenses2
CoatingBroadband AR Coatings (less than .5% reflected from 400 to 700nm)


Crated Shipping Weight500 lbs   (226.8 kg)
Crate Width40 inch   (1,016 mm)
Crate Height48 inch   (1,219 mm)
Crate Length78 inch   (1,981 mm)

Included Accessories

CDK24 Focus Spacer (240343-1)This 5.539″ long spacer is 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 is 8.8″.
Primary Mirror CoverTo protect the primary mirror
PlaneWave Thumb DriveContains software and instructions for collimation and spacing the primary to secondary mirror
12VDC Power SupplyProvides power for the fans (Not included for European orders)
Wrench Set (5812A35)Standard hex wrenches (European orders only)

Included Items

Included Items

Heating elements for dew preventionThe heating pads on the primary and secondary mirror require the 600195 Delta-T controller sold separately
OTA CoverTo protect the primary mirror and inside of the optical tube
FlashdriveContains software and instructions for collimation and spacing the primary to secondary mirror
Wrench Set (5812A35)Standard hex wrenches (European orders only)



For warranty information please check our Standard Warranty page.