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CDK500 Observatory System

SKU# 200130Q

Price: $47,000.00

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Enjoy exceptional optical and tracking performance for astrophotography, or research, with the CDK500 package! Includes a CDK20 optical tube and L-500 mount.

  • CDK20 optical tube:
    • f/6.8 and 3454mm focal length
    • No coma, no off-axis astigmatism, and no field curvature.
    • Pinpoint stars across a 52mm image circle.
    • Rock solid fused silica mirrors with low thermal expansion.
    • Carbon fiber optical tube assembly for rigidity and fast cooling.
    • Simple secondary mirror collimation thanks to the fixed primary mirror.
  • L-500 direct drive mount:
    • Zero periodic error, zero backlash, and minimal maintenance due to the lack of gears.
    • Slew speeds up to 50 degrees/sec for satellite tracking and fast target acquisition.
    • Sidereal tracking accuracy of < 0.30 arcseconds RMS over 5 minutes.
    • High resolution optical encoders on both axes for precision feedback.
    • Can be installed in either equatorial, or alt/az configuration.
    • Includes PWI4 software (ASCOM compliant) for mount control.

Description

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. 

The L-Series combines versatility, simplicity and affordability by combining all the technology of our Observatory class telescopes into a compact stand-alone mount.  In its Alt/Az configuration it is considerably more compact than its equatorial counterpart, allowing a larger telescope to fit in a smaller enclosure. The mass it takes to make a rigid alt/az mount is substantially less, leading to cost savings. Unlike German Equatorial mounts, there are no meridian flips to deal with, and no  large protruding counterweights to create a dangerous hazard in a public observatory. Alt/Az is more intuitive to use and no polar alignment is needed. Besides, it is the way the pros do it!

L-Series Mount Features:

  • Direct-drive motors on each axis for smooth, fast, and virtually silent movement of the telescope
  • Slew speeds up to 50 degrees per second
  • High resolution encoders on each axis for precise positioning
  • Zero backlash
  • Zero periodic error
  • PointXP mount modeling software
  • Enclosed electronics
  • Through the mount cabling

Direct drive motors and encoders

Direct Drive motors and on-axis encoders eliminate the need for  gears, thereby eliminating backlash and periodic error. With high-resolution encoders providing the feedback for the direct drive motors, not only will the telescope track without periodic error and backlash, the mount will also counter wind gusts with precise servo feedback. 

Incredible Slew Speed

The direct drive motors can move the telescope at speeds up to 50 degrees per second for tracking satellites or just to minimize target acquisition time. 

Dual mounting bracket

PlaneWave style mounting bracket to hold CDK17/20 onto inside of fork arm with additional option of mounting a scope on the outside of the fork arm. Optional dovetail clamp required. 

Azimuth dovetail balance system

For precise center of gravity balance whether in Alt-Az or Equatorial configuration 

Through the mount cabling

Access panels in the fork arm and azimuth axis allow for camera equipment cabling through the inside of the mount. 

Proven CDK700/PW1000 Technology

The L-Series uses the same proven technology as the CDK700 and 1-Meter PW1000 which are being used in Universities round the world. 

CDK-500 + Core Accessories:

Item Number

Description

Price

200130QCDK-500 (CDK20 / L-500)$47,000
600180IRF90 Rotating Focuser$  4,500
200901EFA, Focuser Accessory Control$  800
Total$52,300

Specifications

Specifications

Mount System

TypeAlt-Azimuth / Equatorial Direct Drive Mount
Weight257 lbs (100 kg)
Component WeightsAzimuth Base – 121 lbs, Fork Arm – 136 lbs
Max. Load Capacity200 lbs (91 kg)
Latitude Range0 to 90 degrees, Northern and Southern hemispheres
Cable ManagementEquipment cables can be wired through mount

Control System

Control ElectronicsPlaneWave Interface dual axis telescope control
User InterfacePlaneWave Interface 4 (PWI4) Control Software with integrated PointXP mount modeling software
Homing SensorsHome position sensors are included allowing the mount can find its home position on power up.
Slew Rate20 degrees per second (standard); 50 degrees per second (maximum), both axes
Power RequirementAccepts 120 VAC. Supplied with 12VDC 15A Regulated Power Adapter

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)

Motion Control

Motor ControlIndustrial grade brushless motor control system and built in electronics
Motor – Azimuth and AltitudeDirect Drive 3 Phase Axial-Flux Torque Motors
Encoder – Azimuth and Altitude152mm stainless steel encoder ring with reader built into the azimuth and altitude axes. 18,880,000 counts per revolution (0.069 arcsecond resolution).
Motor TorqueApproximately 20 ft-lbs continuous; 50 ft-lbs peak
Drive ElectronicsIndustrial grade, off-the-shelf brushless motor drives for each axis with custom designed interface card
Telescope Control SoftwarePlaneWave Interface (PWI4). Incorporates PointXP mount modeling software by Dave Rowe. Provides HTTP and ASCOM control interfaces.

System Performance

Pointing Accuracy<10 arcsecond RMS with PointXP Model
Pointing Precision

2 arcseconds at sidereal velocity

Tracking Accuracy

< 0.3 arcseconds over a 5 minute period at sidereal velocity

System Natural Frequency10 Hz or greater

For warranty information please check our Standard Warranty Page