20 Inch Ritchey-Chrétien Optical Tube Assembly
Price: $57,500.00
*Price is based on PlaneWave’s Pricing Policy
The PlaneWave Instruments PW20-RC is a 20-inch (0.51 m) f/6.8 Ritchey-Chrétien (RC) Astrograph telescope. The PW20-RC has a dual carbon-fiber truss design, with 3 cooling fans ejecting air from the back of the telescope. 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.
Also available with the CDK (Corrected Dall-Kirkham) optical design
Description
PlaneWave Instruments is pleased to offer the PW20-RC, a 20 inch (0.51 m) telescope with Ritchey-Chrétien optics. PlaneWave’s CDK astrographs have become the telescopes of choice for universities, industry, and astrophotographers around the world, and now PlaneWave offers the PW-RC series to meet the custom needs of the scientific community.
The PW20-RC in its native format (no field flattening lenses) uses only a primary and secondary mirror with reflective coatings. This can be useful when making observations primarily on-axis and wide field imaging is not a concern.
Specifications
Specifications
Optical System
Optical Design | Ritchey-Chrétien (RC) |
Aperture | 20 inch (508 mm) |
Focal Length | 3556mm (140inch) |
Focal ratio | f/7 |
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 |
Secondary Mirror
Diameter | 7.5 inch (191mm) |
Material | Fused Silica |
Shape | Hyperbolic |
Coating | Enhanced Aluminum – 96% |
Primary Mirror
Optical Diameter | 20 inch (508 mm) |
Outer Diameter | 20.5 inch (521 mm) |
Shape | Hyperbolic |
Material | Fused Silica |
Coating | Enhanced Aluminum – 96% |
Shipping
Crated Shipping Weight | 291 lbs (132.0 kg) |
Crate Width | 32 inch (813 mm) |
Crate Height | 36 inch (914 mm) |
Crate Length | 59 inch (1,499 mm) |
Included Accessories
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) |
Wrench Set (5812A35 ) | English Hex Wrenches (European Orders Only) |
For warranty information please check our Standard Warranty Page
Recommended Accessories
Recommended Accessories
OTA Accessories
- Delta T Heater Part (600195)
- Hendrick Focuser (200340)
- IRF90 – Integrated Rotating Focuser (600180)
- EFA kit Electronic Focuser (EFA)
- Light Shroud CDK20 (200970)
- Dovetail Clamp CDK20 (200919)
- Piggyback Dovetail Bars (200990)
Visual Accessories
- Mounting Bracket for Finderscopes (125360)
- Finderscope and Mounting Bracket (6009003)
- Visual Adapter – CDK20 (200399)
- 2 Inch Mirror Diagonal (D1029ED)