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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
Shipping is estimated. Cost will be adjusted and billed separately based on actual charges.
To place an order it is best to contact me to talk about options and 50% deposit required. 7324961519 tolga@tolgaastro.com| Aperture | 20 inch (508 mm) |
| Focal Length | 3454 mm (135.98 inch) |
| Focal ratio | F/6.8 |
| Central Obstruction | 39% of the Primary Mirror Diameter |
| Back Focus from Racked in Focuser | 5.8 inch (147 mm) |
| Weight | 140 lbs (63.5 kg) |
| OTA Length | 47 inch (1,194 mm) |
| Upper Cage | Carbon Fiber Truss |
| Lower Cage | Carbon Fiber Truss with Carbon Fiber Light Shroud |
| Diameter | 7.5 inch (191mm) |
| Material | Precision Annealed Borosilicate |
| Shape | Spherical |
| Coating | Enhanced Aluminum - 96% |
| Optical Diameter | 20 inch (508 mm) |
| Outer Diameter | 20.5 inch (521 mm) |
| Shape | Prolate Ellipsoid |
| Material | Fused SIlica |
| Coating | Enhanced Aluminum - 96% |
| Diameter | 90 mm (3.54 inch) |
| Number of lenses | 2 |
| Coating | Broadband AR Coatings (less than .5% reflected from 400 to 700nm) |
SHIPPING
| Crated Shipping Weight | 291 lbs (132.0 kg) |
| Crate Width | 33 inch (838 mm) |
| Crate Height | 40 inch (1,016 mm) |
| Crate Length | 65 inch (1,651 mm) |
INCLUDED ACCESSORIES
| Ronchi Spacer (200354) | This spacer sits in place of a focuser and is used for setting the primary to secondary spacing. It has an 1 .25” inner diameter and may be used with 1.25” oculars for collimation. |
| Ronchi Ocular | This ocular is a Ronchi screen used for setting the primary to secondary spacing. |
| Primary Mirror Cover | The Primary Mirror Cover protects the primary mirror. |
| Printed Instructions | For Collimation and Spacing |
| 12VDC Power Supply (18778) | Provides power for the fans (Not included for European Orders) |
| Free Shipping | No |
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