PlaneWave - 12.5" CDK12.5 Corrected Dall-Kirkham Carbon Fiber Telescope - Fused Silica - CDK 12.5

SKU
PLA-125104Q
Special Price $10,800.00 Regular Price $12,000.00
Availability : In Stock
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The PlaneWave Instruments CDK12.5 is a 12.5 inch (0.32 m) f/8 Corrected Dall-Kirkham Astrograph telescope. The telescope has a closed carbon fiber tube, with 3 cooling fans ejecting air from the back of the telescope. The CDK12.5 covers a 52 mm field of view without any field curvature, off-axis coma, or astigmatism. The instrument weight is 46 lbs and comes standard with the large capacity 2.75 inch Hedrick focuser.

The 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.

If you choose to place an order for this item, you will be contacted for crating and shipping fee information and options.  To receive a quote contact us at [email protected]

PlaneWave 12.5" CDK12.5 Corrected Dall-Kirkham Carbon Fiber Telescope with Fused Silica Mirrors

The PlaneWave Instruments CDK12.5 is a 12.5 inch (0.32 m) f/8 Corrected Dall-Kirkham Astrograph telescope. The telescope has a closed carbon fiber tube, with 3 cooling fans ejecting air from the back of the telescope. The CDK12.5 covers a 52 mm field of view without any field curvature, off-axis coma, or astigmatism. The instrument weight is 46 lbs and comes standard with the large capacity 2.75 inch Hedrick focuser.

The 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.

Included Items

2.75" to 2" Adapter (125355) Adapts the 2.75" inner diameter of the focuser to a standard 2" inner diameter. This adapter is necessary when setting the primary to secondary spacing. The 125399 Visual 2.75" to 2" adapter is an optional accessory that is designed to space a 2" diagonal for visual use.

  • Ronchi Spacer (200354) This spacer is used for setting the primary to secondary spacing. It has an 1-1/4 inner diameter and may be used with 1-1/4 oculars for collimation.
  • Ronchi Ocular This ocular is a Ronchi screen used for setting the primary to secondary spacing.
    OTA Cover The OTA cover is for closing the front of the tube to protect the primary mirror and the inside of the optical tube.
  • Printed Instructions For Collimation and Spacing
  • 12VDC Power Supply (18778) Provides power for the fans (Not included for European Orders)
  • Wrench Set (5812A35) English Hex Wrenches (European Orders Only)

Planewave CDK 12.5" Features

  • f/8 and 2541mm focal length.
  • No coma, no off-axis astigmatism, and no field curvature.
  • Tack sharp stars across a 52mm image circle.
  • Solid fused silica mirrors with low thermal expansion for consistent results and long term performance.
  • Carbon fiber optical tube assembly for rigidity and fast cooling.
  • Simplified secondary mirror collimation due to the fixed primary mirror.

Hedrick Focuser 2.75"

The included Hedrick focuser is a power performer.  Heavy duty construction with no-slip focusing, this focuser has 1.3 inches of drawtube travel at full extension.  5 bearings, driven by a leadscrew provide focus tube support for smooth and steady racking.   PWI3, Planewave's Interface 3 allows for focusing automation when paired with the optional Planewave Electronic Focuser Accessory and provides accurate and fast autofocusing routines to ensure you always reach focus.

CDK Cooling Fans

Planewave CDK telescopes are equipped with three cooling fans that push air out of the optical tube, thereby pulling air through the telescope and effectively exhausting hot air.  This trio of fans allows the telescope to reach equilibrium quickly and maintain clear views.  These cooling fans are controlled by an easy to reach switch on the optical tube or can be automated with PWI3 software and the optional Planewave EFA Electronic Focus Accessory. 

Dovetail Expansion Joint

To allow for the difference in thermal expansion between the carbon fiber optical tube and aluminum mounting accessories, Planewave has included an expansion joint that permits the aluminum dovetail to expand and contract without putting additional stress on the carbon fiber.  This helps to eliminate image distortion due to temperture fluctuations during a night of imaging.

Warranty

PlaneWave warrants your product to be free from defects in materials and workmanship for a period of one year for optical coatings and two years mechanics and electronics from the date of delivery. This warranty does not cover damage resulting from misuse, abuse, modification not authorized by PlaneWave, control systems that bypass PlaneWave’s software, weather or poor environmental control (rain, ice, snow, dust/sand, pollen, power-surges, brownouts, etc.), improper storage, pests, lightning, fire, flood, earthquake, riot, war, or acts of God.

Planewave CDK12.5 Specifications

Optical System Specifications

Optical System Specifications

Specification Details
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)
Optimal Field of View 52mm image circle
Secondary Mirror Diameter 4.65 inch (118 mm)
Material Fused silica (quartz)
Shape Spherical
Coating Enhanced aluminum – 96%
Primary Mirror Optical Diameter 12.5 inch (318 mm)
Outer Diameter 13 inch (330 mm)
Shape Prolate ellipsoid
Material Fused silica (quartz)
Coating Enhanced aluminum – 96%
Lens Group Diameter 70 mm (2.76 inch)
Number of Lenses 2
Coating Broadband AR coatings (less than .5% reflected from 400 to 700nm)
Shipping Crated Shipping Weight 163 lbs (73.9 kg)
Crate Width 22 inch (559 mm)
Crate Height 29 inch (737 mm)
Crate Length 48 inch (1,219 mm)
More Information
Brand PlaneWave Instruments
Free Shipping Does Not Qualify for Free Shipping
Aperture 12.5"
Case Included No
Focal Length 2541mm
Focal Ratio f/8
Focus Type Hedrick
Finderscope Included No
Diagonal Included No
Optical Tube Material Carbon Fiber
Apparent Field of View 52mm Image Circle
Secondary Mirror Obstruction By Area 42% of the primary mirror diameter
Optical Coatings Aluminum
Optical Tube Weight 46 pounds
Warranty 1 Year
In The Box 12.5” CDK Optical Tube

125355 2.75” - 2” Adapter

200354 Ronchi Adapter

Ronchi Ocular

Collimating and Spacing Printed Instructions

18778 Fan Power Supply

Wrench Set - EU Orders Only

12.5” CDK Optical Tube

125355 2.75” - 2” Adapter

200354 Ronchi Adapter

Ronchi Ocular

Collimating and Spacing Printed Instructions

18778 Fan Power Supply

Wrench Set - EU Orders Only

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