Hubble 10, 12.5, 17, 20-inch CDK (Corrected Dall-Kirkham), and beyond:

UNT astronomy research collaboration unveils its largest telescope


The CDK20 inauguration at MIRA Public Observatory in Belgium National Newspaper

The CDK20 Inauguration Slide Show

A timelapse of the installation of the CDK20

  • The Hubble corrected Dall-Kirkham (CDK) optical configuration is a revolutionary optical design.
  • It is an affordable, high performance solution for astrophotography and visual use, with a large, flat focal surface that is perfect for modern, high resolution, CCD cameras.
  • Outstanding Images - Premium quality, diffraction limited Newtonian optical systems will deliver stunning views of the heavens from dark sky sites.
  • Historically: the SCT has been the industry-standard visual, film and small CCD imaging telescope for popular astronomy since the mid-70s. However, the standard SCT has a highly curved focal surface and suffers from considerable comatic aberration, which limits its useful photographic field to a relatively small image circle. For instance, a 10” all spherical SCT can provide 10-micron spot sizes over only a very small field of about 9mm diameter, which is clearly not suitable for today’s high resolution, large format CCDs.
  • Combined with our revolutionary sandwich primary, Our CDK 10" and 12.5" optics will bring you superior optical performance in real world situations, even without an active cooling system (Active cooling systems, such as fans, introduce their own serious problems, such as micro vibration, which will degrade the image quality more or less). Our mirrors reach equilibrium extremely fast, and without aid.
  • The CDK12.5 primary mirror is made with our revolutionary sandwich mirror. The CDK10 is made with plate or Pyrex solid blank.
  • Our 2-section (completely CNC machined) closed tube OTA prototype is not only optimized to reach a zero thermal focal shift, but is also structurally much stronger than a single section tube.


Hubble CDK10 f/8 OTA Specification:

  • Optical Aperture: 254mm
  • System Focal Ratio: 8
  • Focal Length: 2032mm
  • Field Of View: 55mm
  • Obstruction Ratio: 40%
  • Back Focus (from the the racked in fucser): 110mm
  • Focuser Diameter: 3" Dual Speed Crayford"
  • Weight: 14.5 kg(32 lbs) with the 3" focuser
  • OTA Length: 622mm (without focuser installed)
  • 96% enhanced coated.
  • Delivery Time: ~30Days



Hubble CDK12.5 f/8 OTA Specification:

  • Optical Aperture: 317.5mm
  • System Focal Ratio: 8
  • Field Of View: 60mm
  • Obstruction Ratio: 40%
  • Back Focus (from the racked in focuser): 163.5mm
  • Focuser: 3" dual speed Crayford
  • Weight: 22.7 kg(32 lbs) with the 3" focuser
  • OTA Length: 762mm (without focuser installed)
  • 96% enhanced coated.
  • Delivery Time: ~60Days

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Hubble CDK17 f/8 OTA Specification:

  • Optical Aperture: 432mm
  • System Focal Ratio: 6.8
  • Field Of View: 70mm
  • Obstruction Ratio: 40%
  • Back Focus (from the back plate): 228 mm
  • Focuser: 3" dual speed Crayford
  • Weight: 42 kg without focuser
  • OTA Length: 950mm (without focuser installed)
  • 96% enhanced coated.
  • Delivery Time: ~90Days

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Hubble CDK20 f/6.8 Specification:

  • System Focal Ratio: 6.8
  • Field Of View: 70mm
  • Obstruction Ratio: 40%
  • Back Focus (from the racked in focuser): 254mm
  • Focuser: 3.5" dual speed Crayford
  • Weight: 22.7 kg(32 lbs) with the 3" focuser
  • OTA Length: 1052mm (without focuser installed)
  • 96% enhanced coated.
  • Delivery Time: ~90Days

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OTA Price

To buy CDK Optics(Primary, Secondary Mirrors and Corrector) and also find out shipping costs, please e-mail us!

Diameter CDK OTA (US$)
CDK10 f/8 4,999
CDK12.5 f/8 6,999
CDK17 f/6.8 14,999
CDK20 f/6.8, f/11 23,999
CDK24 f/6.5 39,999
CDK700mm f/6.5 67,999
CDK800mm f/6.5 99,999
CDK40 f/6.5 Contact Us