Astronomy Specialist





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The PlaneWave Instruments CDK12.5 Corrected Dall-Kirkham is an innovative telescope for unsurpassed astroimaging, research, or satellite tracking. With rock-solid fused silica mirrors, carbon fibre construction and pinpoint stars across a 52mm image circle, the CDK12.5 is the capable of capturing the most stunning astrophotographs possible.

The CDK12.5 is an incredible breakthrough in telescope technology and produces no off-axis coma and no off-axis astigmatism. Additionally, the CDK12.5 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 CDK12.5 is an exceptional diffraction-limited telescope. 

CDK12.5 users can experience pinpoint stars edge-to-edge and a 70 x 70 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!



  • Carbon fibre tube minimizes thermal expansion, which causes focus shift as temperature changes during an imaging session. Carbon fibre also reaches ambient temperatures quickly and is extremely lightweight and rigid to help ensure excellent imaging data is produced.
  • Dovetail Expansion Joint allows for the difference in thermal expansion between carbon fiber and aluminium. The expansion joint allows the aluminium dovetail to expand and contract without stressing the carbon fiber lower truss.
  • 2.75-inch heavy-duty, no-slip Hedrick Focuser with 1.3" of drawtube travel when fully racked out. The focus tube runs on 5 bearings and is driven by a leadscrew, so there is no chance of slipping. Focusing is automated through PlaneWave Interface 3 (PWI3) software when using the sold separately PlaneWave Electronic Focuser Accessory.
  • Three cooling fans blow out of the optical tube pulling air through 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 controlled by via PWI3 software.


Optical system

Aperture 12.5" (318 mm)
Focal length
2541 mm
Focal ratio
Central obstruction
Backfocus from mounting surface
265 mm
Backfocus from racked in focuser
183 mm
OTA length
787 mm
Optimal field of view 52 mm image circle
Weight (with manual focuser & dovetail) 20.9 kg
Weight (with electronic focuser & dovetail) 22 kg

Primary mirror

Optical diameter
318 mm
Outer diameter 330 mm
Fused silica (quartz)
Prolate ellipsoid
Enhanced aluminium - 96%


Secondary mirror

118 mm
Fused silica (quartz)
Enhanced aluminium - 96%


Lens group

70 mm
Number of lenses
Broadband AR coatings (less than .5% reflected from 400 to 700nm)



  • CDK12.5 OTA
  • OTA cover to protect primary mirror
  • Printed instructions
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