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CDK20 Astrograph f/7.77 with Fused Silica Optics

# 1323222Q Price: € 45,850.00
(Price incl. German VAT excl. shipping)

PlaneWave CDK20 Astrograph f/7.77

The 20" CDK is a telescope optical system that is designed to excel at imaging on large format CCD cameras while remaining an excellent instrument for visual use.

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) 20″ telescope was centered around performance and ease of use. The CDK20 is an incredible breakthrough in telescope technology and produces no off-axis coma and no off-axis astigmatism. Additionally, the CDK20 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 CDK20 is an exceptional diffraction-limited telescope. CDK20 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!

The telescope is also available in Ritchey-Chrétien (RC) optics and infrared optimized.

  • CDK 20 Astrograph, 20 inch with Fused Silica Optics
  • Additional 1.9″ of backfocus and 497 mm of focal length compared to the standard CDK20 f/6.8 model.
  • modified to Dall-Kirkham, with fully corrected image field
  • with 8" Dovetail, focal length 3.951mm (f/7.77)
  • Pinpoint stars across a 52mm image circle.
  • Delta T Ready, 3,5" Hedrick Focuser and EFA Kit separately available
  • Requires a crating #1323520. The crating will be charged extra


Fused Silica
Scope of delivery
Recommended Accessories


Optical Design
Corrected Dall-Kirkham (CDK)
Aperture (mm)
20" (508 mm)
Focal Length
3951 mm (155.55 inch)
Focal Ratio
Image Field
52 mm
Back Focus Distance
10.7 inch (271.98 mm) from mounting surface
Central Obstruction
39% of the Primary Mirror Diameter
Fused Silica
Optical length
47 inch (1.194 mm)
Optical Tube Weight
140 lbs (63.5 kg)
No mount (OTA only)
Manufacturer SKU
EAN Code

PlaneWave Live: CDK20 Astrograph f/7.77


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