PlaneWave CDK24 Astrograph f/6.5 (various versions available)

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PlaneWave CDK24 Astrograph f/6.5 (various versions available)
From:

Regular Price: € 61,900.00

Special Price Excl. Tax: € 42,605.04 Incl. Tax: € 50,700.00

  • CDK24 Astrograph, 24 inch with Borosilicate Optics or Fused Siica Optics
  • modified to Dall-Kirkham, 610 mm aperture and 70 mm field of view without any curvature, off-axis coma, or astigmatism
  • local length 3.962 mm (f/6.5)
  • Delta T Ready, 3,5" Hedrick Focuser and EFA Kit separately available
Important note: This product is not available online. If you are interested, please send us a formal inquiry incl. contact data by email. We shall gladly provide a detailed offer.

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From:

Regular Price: € 61,900.00

Special Price Excl. Tax: € 42,605.04 Incl. Tax: € 50,700.00

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PlaneWave CDK 24"

CDK 24

The CDK24 is a 24 inch (0.61 m) f/6.5 Corrected Dall-Kirkham Astrograph telescope. The CDK24 covers a 70 mm field of view without any field curvature, off-axis coma, or astigmatism. The instrument weight is 240 lbs (109 kg) and comes standard with a back plate retaining ring ready to accept the focuser of your choice.

The PlaneWave CDK 24 is available in various types of mirror material. Standard mirror material is borosilicate. The telescope is also available in fused silica optics, Ritchey-Chrétien (RC) optics and infrared optimized.

Fused Silicia is a synthetic amorphous silica glass of the highest purity and one of the most transparent glasses made. The optical and thermal properties of fused silica are superior to other types of glass due to its purity. Its transmission and homogeneity exceed those of crystalline quartz without the problems of temperature instability inherent in the crystalline form. Fused Silica has a coefficient of thermal expansion six times lower than Borosilicate (Pyrex) glass, which means that as fused silica cools down, it preserves its shape to a high degree of accuracy. This translates into consistent optical performance and unchanging focus over temperature changes. With its high melting temperature ()~ 1.600 degree Celsius), a very low coefficient of thermal expansion and resistance to thermal shock, fused silica is the material of choice for professional observatories as well as various scientific applications.

The abbreviation CDK stands for the optical system of the PlaneWave astrographs - a Dall Kirkham Cassegrain with a optical correction unit. The CDK design far exceeds the off-axis performance of most commercial telescope designs including the Ritchey-Chrétien design. More about the Optical Design (CDK).

 

New "state of the art" observatory at the University of Leicester

Testaufbau
 
 

At the Advanced Imaging Conference (AIC) in Santa Clara, California in October 2010 AstroPhysics and Planewave exhibited togehter to showcase their 24" CDK (Corrected Dall-Kirkham) Astrograph on the Astro-Physics 3600GTO German Equatorial. The scope weighs 240 lbs and the counterweights are an additional 240 lbs.

Ray Gralak presented the beta version of a new software - Astrophysic Command Center - which allows to control all GTO mounts with GTOCP3 control box.

More pictures and videos are available here: www.astro-physics.com

 

The CDK 24 was "the audience magnet" at the 26th ATT in Essen

Testaufbau
 
 

Europe premiere for the CDK 24" Dall Kirkham Astrograph telescope by PlaneWave Instruments, 610 mm aperture, f / 6.8 and 70 mm image field - absolutely free from coma and astigmatism.

 

Pictures taken by CDK24":

NGC2024 (The Fame Nebula)- James Turner
NGC2024 (The Fame Nebula)- James Turner
Caldwell 49, Rosette Nebula
Caldwell 49, Rosette Nebula
NGC 2175, Monkey Head Nebula
NGC 2175, Monkey Head Nebula
M 42, The Orion Nebula
M 42, The Orion Nebula
 

Specifications:

OPTICAL SYSTEM

Aperture 24 inch (610 mm)
Focal Length 3962 mm (155.98 inch)
Focal ratio f/6.5
Central Obstruction 47% of the Primary Mirror Diameter
Back Focus from Mounting Surface 14.1 inch (358 mm)
Back Focus from Racked in Focuser 5.81 inch (148 mm)
Weight 240 lbs (108.9 kg)
OTA Length 56 inch (1,422 mm)
UpperCage Carbon Fiber Truss
Lower Cage Carbon Fiber Truss with Aluminum Light Shroud
OTA Width 31 inch (787 mm)
OTA Height 35 inch (889 mm)
Optimal Field of View 70mm Image Circle

 

SECONDARY MIRROR

Diameter 9.45 inch (240 mm)
Material Precision Annealed Borosilicate or Fused Silica
Shape Spherical
Coating Enhanced Aluminum - 96%

PRIMARY MIRROR

Optical Diameter 24 inch (610 mm)
Outer Diameter 24.5 inch (622 mm)
Shape Prolate Ellipsoid
Material Precision Annealed Borosilicate or Fused Silica
Coating Enhanced Aluminum - 96%

 

LENS GROUP

Diameter 135 mm (5.31 inch)
Number of lenses 2
Coating Broadband AR Coatings (less than .5% reflected from 400 to 700nm)

 

STANDARD FEATURES

Carbon Fiber Tube Design Minimizes thermal expansion which causes focus shift with changes in temperature
Dovetail expansion joint Allows 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 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.
CDK 24CDK 24CDK 24
 
CDK 24CDK 24CDK 24
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Specifications

Additional Information

Manufacturer Planewave
SKU (#) pw-CDK24
Optical Design Corrected Dall-Kirkham (CDK)
Back Focus Distance 14.1" (358 mm) from Mounting Surface, 5.81" (148 mm) from Racked in Focuser
Aperture (mm) 24" (610 mm)
Focal Length 3.962 mm (155.98 inch)
Image Field 70 mm
Central Obstruction 47% of the Primary Mirror Diameter
Substrate Borosilicate,Fused Silica
Focal Ratio f/6.5
Optical tube length 55,98 inch (1.422 mm)
Optical Tube Weight Copy 240 lbs (109 kg)
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