20 inch Ritchey-Chrétien Optical Tube Assembly
Price: $57,500.00
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 | 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 |
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