Planewave CDK 17 Optical Tube Assembly

£27,945.00

(1 Review)

✓ 2 year warranty

Product description
In the box
FAQ

:	Out of stock due 30-40 working days

Notify me when back in stock

Ask a Question Ask a Wishlist

Add To Wishlist

Send To Friend

About this product

Model: planewave_cdk17

The CDK17 is an innovative solution for unsurpassed astro imaging quality at an affordable price. The CDK telescope design provides excellent imaging 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.

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 CDK design will give you pinpoint stars from the centre to the corner of the field of view.

The CDK 17 features an Open truss tube design with carbon fibre frame minimises thermal expansion which causes focus shift with changes in temperature. Carbon fibre truss design also promotes quick thermal cooling and provides a rigid, lightweight structure.

Planewave uses digital 3D printing technology to produce lightweight baffle tubes. 3D printers add successive layers of material to construct a baffle system with precision positioned internal stray light baffles to minimise vignetting and maximise image contrast.

The 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.

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.

Price includes 1323517 Shipping and Storage Crate

SPECIFICATIONS

OPTICAL SYSTEM

Optical Design	Corrected Dall-Kirkham
Aperture	17 inch (432 mm)
Focal Length	2939 mm (115.71 inch)
Focal ratio	F/6.8
Central Obstruction	23.7% by surface area; 48.6% of the Primary Mirror Diameter
Back Focus from Mounting Surface	10.24 inch (260 mm)
Back Focus from Racked in Focuser	7.24 inch (184 mm)
Weight	106 lbs (48 kg)
OTA Length	42 inch (1067 mm)
Optical Performance	6.5 micron rms at 21mm and 9.6 micron at 26mm off-axis
Upper Cage	Carbon Fibre Truss
Lower Cage	Carbon Fibre Truss with Carbon Fibre Light Shroud
Optimal Field of View	70mm Image Circle

SECONDARY MIRROR

Diameter	190 mm (7.48 inch)
Material	Precision Annealed Pyrex
Shape	Spherical
Coating	Enhanced Aluminium – 96%

PRIMARY MIRROR

Optical Diameter	17 inch (432 mm)
Outer Diameter	17.5 inch (445 mm)
Shape	Prolate Ellipsoid
Material	Precision Annealed Borosilicate or Fused Silica
Coating	Enhanced Aluminium – 96%

LENS GROUP

Diameter	105 mm (4.13 inch)
Number of lenses	2
Coating	Broadband AR Coatings (less than .5% reflected from 400 to 700nm)

STANDARD FEATURES

Carbon Fibre 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 ejecting air from the back of the telescope and four fans blowing across the boundary layer of the mirror surface. 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.