PlaneWave CDK500 Telescope System f/6.8

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PlaneWave CDK500 Telescope System f/6.8

# 1323250Q

€ 62,900.00 Price excl. German VAT tax (19%): € 52,857.14

  • PlaneWave CDK500 Telescope System f/6.8 with Fused Silica Optics
  • incl. a CDK20 Astrograph and L-500 Mount
    • CDK20 Astrograph, 20 inch, modified to Dall-Kirkham, with fully corrected image field
    • with 8" Dovetail, 3.454 mm (f/6,8), 52 mm field of view
    • Delta T Ready, 3,5" Hedrick Focuser and EFA Kit separately available

    • L-500 can hold payload of over 200 lbs for CDK20
    • Zero Backlash, Zero Periodic Error
    • Incredible slew speed up to 50 degrees per second
    • With integrated high resolution encoders
    • Through the mount cabling
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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PlaneWave CDK500 Telescope System f/6.8

Based on the technology of our PW-1000 (1-meter) Observatory telescope, PlaneWave combines its revolutionary optical systems with its brand new innovative L-Series direct drive mount that sets a new standard for small observatory telescopes.

PlaneWave CDK500 Telescope System f/6.8 consits of the CDK20 and the L-500 Direct Drive Mount with integrated high resolution encoders and high speed slewing.

The 20" CDK is a telescope optical system that is designed to excel at imaging on large format CCD cameras while remaining an excellent instrument for visual use.

One of the unique features of the CDK design is its ease of collimation and achievable centering tolerance for a telescope of its class. This assures the user will get the best possible performance out of the telescope. The end result is a telescope which is free from off-axis coma, off-axis astigmatism, and curvature of field, yielding a perfectly flat field all the way out to the edge of a 52mm image circle.

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.

Images taken with CDK20":

M 27, Dumbbell Nebula
M 27, Dumbbell Nebula
Arp 316, (NGC 3193, 3187, 3189) and NGC 3185
Arp 316, (NGC 3193, 3187, 3189) and NGC 3185
NGC 5139, Omega Centauri
NGC 5139, Omega Centauri
Draco Trio of Galaxies
Draco Trio of Galaxies

The L-Series combines versatility, simplicity and affordability by combining all the technology of our Observatory class telescopes into a compact stand-alone mount.

The mount is equipped with direct drives motors as well as high-resolution encorders. The software is ASCOM compatible and the direct drive motors can move the telescope at incredible speeds for tracking satellites.

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.

L-Serie Features:

L-500 Direct Drive Mount
Planewave L-Series Direct Drive Mount wire cabeling
  • 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
  • Latitude Range:  0 to 90 degrees, Northern and Southern hemispheres
  • Enclosed electronics
  • Through the mount cabling: Access panels in the fork arm and azimuth axis allow for camera equipment cabling through the inside of the mount.
  • 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

Control System

  • User Interface: PlaneWave Interface 4 (PWI4) Control Software with integrated PointXP mount modeling software
  • Slew Rate: 20 degrees per second (standard); 50 degrees per second (maximum), both axes
  • Home position sensors are included allowing the mount can find its home position on power up.
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Additional Information

Manufacturer Planewave
SKU (#) 1323250Q
Optical Design Corrected Dall-Kirkham (CDK)
Aperture (mm) 20" (508 mm)
Focal Length 2.939 mm (115.71 inch)
Focal Ratio f/6.8
Image Field 52 mm
Back Focus Distance 10.24" (260 mm) from Mounting Surface, 7.24" (184 mm) from Racked in Focuser
Central Obstruction 23.7 % by surface area, 49% of the Primary Mirror Diameter
Substrate Fused Silica
Optical Tube Weight 106 lbs (48 kg)
Mount Equatorial & Alt-Az Single-Arm mount
Payload Capacity (kg) 200 lbs (91 kg)
Mount Type Alt-Az or Equatorial configuration
Mount Weight 100 kg
Latitude Range 0 to 90 degrees, Northern and Southern hemisphere
Slew Speeds 20 degrees per second (standard); 50 degrees per second (maximum), both axes
Tracking Accuracy < .3 arcsecond error over 5 minute period
All-sky pointing accuracy <10 arcsecond RMS with PointXP Model
Pointing Precision 2 arcsecond
System Natural Frequency 10 Hz or greater
Software PlaneWave Interface (PWI4). Incorporates PointXP mount modeling software by Dave Rowe All ASCOM compatible
Homing Sensors Home position sensors are included allowing the mount can find its home position on power up
Motor Torque Approximately 20 ft-lbs continuous; 50 ft-lbs peak
Motor Azimuth and Altitude: Direct Drive 3 Phase Axial-Flux Torque Motors
Control system electronics PlaneWave Interface dual axis telescope control
Encoder 152mm disk built into the azimuth and altitude axes with stainless steel encoder on the circumference with reader yields 18,880,000 counts per revolution of the telescope. This translates to about 0.069 arcsecond resolution
Motor Control Industrial grade brushless motor control system and built in electronics
Power Requirements Accepts 120 VAC. Supplied with 12VDC 15A Regulated Power Adapter

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