Planewave CDK 12.5 Optical Tube Assembly

Planewave CDK 12.5 Optical Tube Assembly

£14,950.00✓ 2 year warranty


Out of stock due 30-40 working days

About this product

Model:  planewave_cdk12

The PlaneWave Instruments CDK12.5 is a 12.5 inch (0.32 m) f/8 Corrected Dall-Kirkham Astrograph telescope and is the smallest and lightest of PlaneWave's OTA offerings weighing only ~21kg (46lbs). This means the telescope can be mounted on medium mounts such as the 10Micron GM2000, Paramount MX+ etc.

The CDK12.5  is an innovative solution for unsurpassed astroimaging quality at an affordable price. The CDK telescope design provides excellent imaging with large format CCD cameras while remaining superb for visual use. The Corrected Dall-Kirkham far exceeds the off-axis performance of most commercial telescope designs including the Ritchey-Chrétien design.

This no-compromise design is unique in making the optical alignment forgiving and collimation very easy. This guarantees the user the best possible performance from the telescope. The end result at the image plane of the CDK design is no off-axis coma, no off-axis astigmatism, perfectly flat field (no off-axis defocus). The CDK12.5  will give you pinpoint stars from the centre to the corner of the field of view.

The telescope has a closed carbon fibre tube, 3 cooling fans ejecting air from the back of the telescope to cool the telescope's mirrors to help bring the telescope into thermal equilibrium.

Carbon Fibre Tube Design - Minimises thermal expansion which causes focus shift with changes in temperature.

Dovetail Expansion Joint - Allows for the difference in thermal expansion between carbon fibre and aluminium. The expansion joint allows the aluminium dovetail to expand and contract without stressing the carbon fibre lower truss

2.75 Inch Hedrick Focuser - Heavy-duty no-slip focuser. The focus tube runs on 5 bearings and is driven by a lead screw so there is no chance of slipping. Focusing may be automated through a computer using PlaneWave’s EFA Kit add-on. The draw tube travel is 1.3 inch.

Cooling Fans - Three 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 a computer if the optional Electronic Focus Accessory (EFA Kit) is purchased.

Price includes 1323512 Shipping and Storage Crate



Aperture 12.5 inch (318 mm)
Focal Length 2541 mm (100.04 inch)
Focal ratio f/8
Central Obstruction 42% of the Primary Mirror Diameter
Back Focus from Mounting Surface 10.445 inch (265 mm)
Back Focus from Racked in Focuser 7.2 inch (183 mm)
OTA Length 31 inch (787 mm)
Optical Tube Carbon Fiber
Dimensions Overall Dimensions (PDF)
Weight (includes manual-focuser and dovetail) 46 lbs (20.9 kg)
Weight (includes electronic-focuser and dovetail) 48.5 lbs (22.0 kg)


Diameter 4.65 inch (118 mm)
Material Precision Annealed Borosilicate or Fused Silica
Shape Spherical
Coating Enhanced Aluminum – 96%


Optical Diameter 12.5 inch (318 mm)
Outer Diameter 13 inch (330 mm)
Shape Prolate Ellipsoid
Material Precision Annealed Borosilicate or Fused Silica
Coating Enhanced Aluminum – 96%


Diameter 70 mm (2.76 inch)
Number of lenses 2
Coating Broadband AR Coatings (less than .5% reflected from 400 to 700nm)



What's in the box


  • 2.75" to 2: Adaptor
  • Ronchi Spacer
  • Ronchi Ocular
  • OTA Cover
  • Printed Instructions
  • 12v DC Power Supply

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