Planewave CDK 14 Optical Tube Assembly

£20,200.00✓ 2 year warranty

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About this product

Model: planewave_cdk14

The CDK14 telescope utilises the Corrected Dall-Kirkham (CDK) optical design, developed by Dave Rowe, that provides excellent imaging possibilities with large format CCD cameras, while remaining superb for visual use.

The CDK design far exceeds the off-axis performance of most commercial telescope designs including the Ritchey-Chrétien design making the CDK an innovative solution for unsurpassed astro-imaging quality at an affordable price.

The end result, at the image plane of the CDK14, will give you pinpoint stars from the center to the corner of its 70mm field of view without any field curvature, off-axis coma, or astigmatism. The no-compromise optical design is unique in making the optical alignment forgiving and collimation very easy which guarantees the user the best possible performance from the telescope.

The CDK14 features a dual carbon-fibre truss design, with 3 cooling fans blowing air throughout the back of the telescope, The instrument weighs 22kg (48 lbs) and comes as standard with a back plate retaining ring ready to accept the focuser of your choice. The relatively low weight of the CDK14 means it can be used, with additional accessories, on medium sized mounts such as the 10Micron GM2000 (or above) or the Paramount MX+ (and above).

The CDK14 telescope is an open truss tube design for a rigid, but lightweight structure, and for quick thermal cooling. The truss tube utilises a carbon fibre frame which minimises thermal expansion that can cause focus shift with changes in temperature. The carbon fibre truss tube design also promotes quick thermal cooling.

To create the telescope's baffles, Planewave uses digital 3D printing technology. Their 3D printers add successive layers of material to construct a baffle system with precision. These internal stray light baffles minimise vignetting and maximise image contrast.

To mount the CDK14 onto a mount, PlaneWave supplies the CDK with a dovetail bar. The CDK features a dovetail expansion joint that allows for the difference in thermal expansion between carbon fibre and aluminium. This expansion joint allows the aluminium dovetail expand and contract without stressing the carbon fibre lower truss.

To help the primary mirror to cool, there are three cooling fans that blow air inside the back of the telescope. Furthermore, internal diverting fins circulate air flow behind the mirror for even cooling to help the telescope reach thermal equilibrium quickly. The fans are controlled by a computer if the optional Electronic Focus Accessory (EFA Kit) is purchased.

For dew prevention, the CDK14 is internally wired with polyimide film heater pads and temperature sensor, ready to be controlled with the optional Delta-T controller.

Includes 1323514 Shipping and Storage Crate

OPTICAL SYSTEM

Optical Design	Corrected Dall-Kirkham (CDK)
Aperture	14 inch (356mm)
Focal Length	2563mm (101 inch)
Focal ratio	F/7.2
Central Obstruction	23.5% by surface area; 48.5% by diameter
Back Focus from Mounting Surface	11.09 inch (282 mm)
Weight	48 lbs (22 kg)
OTA Length	35 inch (889 mm)
Optical Performance	3.1 micron RMS at 13mm off-axis; 6.0 micron RMS at 35mm off-axis
Upper Cage	Carbon Fibre Truss
Lower Cage	Carbon Fibre Truss and Light Shroud
Optimal Field of View	70mm Image Circle

SECONDARY MIRROR

Diameter	165 mm (6.5 inch)
Material	Precision Annealed Borosilicate
Shape	Spherical
Coating	Enhanced Aluminium - 96%

PRIMARY MIRROR

Optical Diameter	14 inches (355.6)
Outer Diameter	14.5 inches (468.3mm)
Shape	Prolate Ellipsoid
Material	Precision Annealed Borosilicate or Fused Silica
Coating	Enhanced Aluminium - 96%

LENS GROUP

Diameter	95mm (3.7 inch)
Number of lenses	Two
Coating	broadband AR Coatings (less than .5% reflected from 400 to 700nm)

STANDARD FEATURES

CDK Optics	The Corrected Dall-Kirkham design yields a perfectly flat field free from off-axis astigmatism, coma and defocus.
Carbon Fiber Truss 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 expand and contract without stressing the carbon fibre lower truss
Cooling Fans	Three cooling fans blow air inside the back of the telescope. This helps the telescope to reach thermal equilibrium quickly. The fans are controlled by a computer if the optional Electronic Focus Accessory (EFA Kit) is purchased.
Delta-T Ready	For added dew prevention, the CDK14 is internally wired with polyimide film heater pads and temperature sensor, ready to be controlled with the optional Delta-T controller.