PlaneWave 20″ CDK Fused Silica Glass

Brand: Planewave
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  5. PlaneWave 20″ CDK Fused Silica Glass
Brand: Planewave
SKU: 200104Q
$62,599.00

– Price shown includes GST
– GST is removed at checkout for NZ

Not currently in stock. You can backorder now, but product will be delayed by two weeks or more due to global logistics.

For better availability information call 02 9518 7255 or email sales@bintel.com.au

QUANTITY

The PlaneWave 20″ CDK (Corrected Dall-Kirkham) Optical Design 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 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 center to the corner of the field of view. More about our Optical Design

The PlaneWave Instruments CDK20 is a 20 inch (0.51 m) f/6.8 Corrected Dall-Kirkham Astrograph telescope. The CDK20 has a dual carbon-fiber truss design, with 3 cooling fans ejecting air from the back of the telescope. The CDK20 covers a 52 mm field of view without any field curvature, off-axis coma, or astigmatism. The instrument weight is 140 lbs (64 kg) and comes standard with a back plate retaining ring ready to accept the focuser of your choice.

All CDK20 telescopes come with  Fused Silica primary and secondary mirrors

Features:

Carbon Fiber Truss DesignMinimizes thermal expansion which causes focus shift with changes in temperature
Dovetail expansion jointAllows for the difference in thermal expansion between carbon fiber and aluminum. The expansion joint allows the aluminum dovetail expand and contract without stressing the carbon fiber lower truss
Cooling FansThree cooling fan blow out of the optical tube pulling air though the telescope and pass the primary mirror. 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 ReadyFor added dew prevention, the CDK20 is internally wired with polyimide film heater pads and temperature sensor, ready to be controlled with the optional Delta-T controller.

OPTICAL SYSTEM

Aperture20 inch (508 mm)
Focal Length3454 mm (135.98 inch)
Focal ratioF/6.8
Central Obstruction39% of the Primary Mirror Diameter
Back Focus from Racked in Focuser5.8 inch (147 mm)
Weight140 lbs (63.5 kg)
OTA Length47 inch (1,194 mm)
Upper CageCarbon Fiber Truss
Lower CageCarbon Fiber Truss with Carbon Fiber Light Shroud

SECONDARY MIRROR

Diameter7.5 inch (191mm)
MaterialFuses Silica
ShapeSpherical
CoatingEnhanced Aluminium – 96%

PRIMARY MIRROR

Optical Diameter20 inch (508 mm)
Outer Diameter20.5 inch (521 mm)
ShapeProlate Ellipsoid
MaterialFused SIlica
CoatingEnhanced Aluminium – 96%

LENS GROUP

Diameter90 mm (3.54 inch)
Number of lenses2
CoatingBroadband AR Coatings (less than .5% reflected from 400 to 700nm)

SHIPPING

Crated Shipping Weight291 lbs   (132.0 kg)
Crate Width33 inch   (838 mm)
Crate Height40 inch   (1,016 mm)
Crate Length65 inch   (1,651 mm)

INCLUDED ACCESSORIES  

Ronchi Spacer (200354)This spacer sits in place of a focuser and is used for setting the primary to secondary spacing. It has an 1 .25”  inner diameter and may be used with 1.25” oculars for collimation.
Ronchi OcularThis ocular is a Ronchi screen used for setting the primary to secondary spacing.
Primary Mirror Cover The Primary Mirror Cover protects the primary mirror.
Printed Instructions For Collimation and Spacing

NOTE:  This product has a lengthy leadtime. For more details email: education@bintel.com.au

PlaneWave 20″ CDK Fused Silica Glass

SKU: 200104Q

Aperture: 508mm (20″)

Focal Length: 3454mm

Focal Ratio:  f/6.8

Imager Circle: 52mm without any field curvature, off-axis coma, or astigmatism

Weight:  64kg (140lbs)

 

 

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