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

Model#: 125101

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Availability: In stock

$12,000.00

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Manufactured by: PlaneWave Instruments

Details

 

PlaneWave 12.5" CDK 

The new CDK optical design is the innovative solution for unsurpassed astroimaging quality at an affordable price. The purpose of the design is to provide a telescope that will excel at 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-Chretien design. The RMS spot sizes at the edge of a 52mm diameter image circle yield are 12 microns, about the size of a pixel of most CCD cameras.

This no-compromise design is unique in making the optical alignment very forgiving and collimation very easy. This guarantees the user will be sure to get the best performance out of the telescope possible. 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), all the way out to a 52mm image circle. All this means, the stars will be pinpoints from the center of the field of view out to the corner of the field of view.

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
2.75 inch Hedrick Focuser Heavy duty no-slip focuser. The focus tube runs on 5 bearings and is driven by a leadscrew so there is no chance of slipping. Focus may be automated through a computer using PlaneWave's EFA Kit add-on. The draw tube travel is 1.3 inch. 
Cooling Fans

Three fans blow out of the optical tube pulling air though the telescope and by the primary mirror. This helps the telescope to reach thermal equilibrium quickly. The fans are controlled by a switch on the optical tube or can be conrolled by a computer if the optional Electronic Focus Accessory (EFA Kit) is purchased.

PRIMARY MIRROR

Diameter 13 inch (330 mm)
Aperture 12.5 inch (318 mm)
Focal ratio f/3
Mounting Laser Collimated and Permanently Fixed
Material Precision Annealed Pyrex
Shape Prolate Ellipsoid
Coating Broadband AR Coatings (less than .5% reflected from 400 to 700nm)

 

SECONDARY MIRROR

Diameter 4.65 inch (118 mm)
Material Precision Annealed Pyrex
Shape Spherical
Coating Broadband AR Coatings (less than .5% reflected from 400 to 700nm)

 

 

LENS GROUP

Diameter 70 mm (2.76 inch)
Number of lenses 2
Coating Broadband AR Coatings (less than .5% reflected from 400 to 700nm)

INCLUDED ACCESSORIES 

2.75" to 2" Adapter (125399)

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)

 

 

 

 

 

 

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Product Series

The CDK telescope is a brand new optical design invented by Dave Rowe. The goal of the design is to make an affordable astrographic telescope with a large enough imaging plane to take advantage of the large format CCD cameras of today. Most telescope images degrade as you move off-axis from either coma, off-axis astigmatism, or field curvature. The CDK design suffers from none of these problems. The CDK is coma free, has no off-axis astigmatism, and has a flat field. The design is a simple and elegant solution to the problems posed above. The CDK consists of three components: an ellipsoidal primary mirror, a spherical secondary mirror and a lens group. All these components are optimized to work in concert in order to create superb pinpoint stars across the entire 42mm image plane.

Additional Information

Name PlaneWave - 12.5" CDK12.5 Corrected Dall-Kirkham Carbon Fiber Telescope
Manufacturer PlaneWave Instruments
Model 125101
Aperture 12.5 inch (318 mm)
Backfocus Distance 10.445 inch (265 mm) from focuser mounting surface
Focal Length 2541 mm (100.04 inch)
Focal Ratio f/8
Optical Coatings Broadband AR Coatings (less than .5% reflected from 400 to 700nm)
Optical Tube Carbon Fiber
Optical Tube Length 31"
Primary Mirror 13 inch (330 mm)