IRDK20 (Infrared Optimized)
Price: $37,500.00
*Price is based on PlaneWave’s Pricing Policy
The IRDK20 is a 20-inch infrared-optimized optical tube designed for research applications where on-axis performance is crucial.
- Dall-Kirkham optical design
- Focal length of 3,454 mm (f/6.8)
- Mirror coatings that are optimized to transmit in infrared wavelengths (ultraviolet optimization available)
- Fused silica mirrors with low thermal expansion
- Ready for Delta-T dew prevention
Description
This is a Dall-Kirkham optical design with coatings that are optimized to transmit in infrared wavelengths. There are no refractive lenses, only reflective components to the design. For IR application, reflective coatings are a protected gold that gives better than 98% reflectivity from .65 micron (650nm) to 5 micron (5000nm). This design is ideal for infrared astronomy or LIDAR applications. UV-optimized coatings can be provided as well, so please reach out to our technical sales team to discuss UV optimization.
- IRDK20 is a 20 inch infrared optimized optical tube with fused silica mirrors
- Focal length of 3,454 mm (f/6.8)
- Dall-Kirkham optical design with coatings that are optimized to transmit in infrared wavelengths (ultraviolet optimization available)
- Ready for Delta-T dew prevention
IRDK 20 Features
Carbon Fiber Truss Design
Minimizes thermal expansion which causes focus shift as temperature changes during an imaging session. Carbon fiber also reaches ambient temperatures quickly and is extremely lightweight and rigid to help ensure excellent imaging data is produced.
3D Printed Baffles
PlaneWave uses digital 3D printing technology to produce lightweight baffle tubes. 3D printers add successive layers of material to construct a baffle system with precision positioned internal stray light baffles to minimize vignetting and maximize image contrast. Quality baffling makes an incredible difference in overall image quality, so we ensured an optimal design was created for our telescopes.
Dovetail Expansion Joint
Allows for the difference in thermal expansion between carbon fiber and aluminum. The expansion joint allows the aluminum dovetail to expand and contract without stressing the carbon fiber lower truss. This results in images that are not distorted due to expansion, or contraction of the optical tube materials.
Delta-T Ready
For added dew prevention, the CDK20 is internally wired with polyimide film heater pads and temperature sensor, which is ready to be controlled with the Delta-T via PlaneWave Interface 3 software.
Cooling Fans
Three fans on the backplate of the optical tube pull air through the telescope and by the primary mirror. Three fans on the side of the optical tube also blow air across the primary to ensure a boundary layer of air does not distort images. These fans help the telescope reach thermal equilibrium quickly, further reducing any distortion in images due to temperature variations. The fans are controlled by a switch on the optical tube, or can be controlled by via PWI3 software if a PlaneWave Electronic Focus Accessory (EFA Kit) is purchased.
Specifications
Specifications
Optical System
Aperture | 20 inch (508 mm) |
Focal Length | 3454 mm (136 in) |
Focal ratio | F/6.8 |
Central Obstruction | 39% of the Primary Mirror Diameter |
Back Focus from mounting surface | 8.81 inch (224 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 |
Optimal Field of View | 52mm image circle |
Secondary Mirror
Diameter | 7.5 inch (191mm) |
Material | Fused silica (quartz) |
Shape | Spherical |
Coating | Gold Protected |
Primary Mirror
Optical Diameter | 20 inch (508 mm) |
Outer Diameter | 20.5 inch (521 mm) |
Shape | Prolate ellipsoid |
Material | Fused silica (quartz) |
Coating | Gold Protected |
Shipping
Crated Shipping Weight | 291 lbs (132.0 kg) |
Crate Width | 33 inch (838 mm) |
Crate Height | 33 inch (838 mm) |
Crate Length | 65 inch (1,651 mm) |
Included Accessories
Included Accessories
Primary Mirror Cover | To protect the primary mirror |
PlaneWave Thumb Drive | Contains software and instructions for collimation and spacing the primary to secondary mirror |
12VDC Power Supply | Provides power for the fans (Not included for European Orders) |
Wrench Set (5812A35) |
Standard hex wrenches (European orders only) |
Recommended Accessories
Recommended Accessories
OTA Accessories
- Reducer .66x CDK20 (200166)
- Delta T Heater Part (600195)
- Hendrick Focuser (200340)
- IRF90 – Integrated Rotating Focuser (600180)
- EFA kit Electronic Focuser (240901-KIT)
- Light Shroud CDK 20 (200970)
- Dovetail Clamp CDK20 (200919)
Visual Accessories
- Mounting Bracket for Finderscopes (125360)
- Finderscope and Mounting Bracket (6009003)
- Visual Adapter – CDK20 (200399)
- 2 Inch Mirror Diagonal (DDP-8804)
Mount Accessories
Downloads
Downloads
Articles
Drawings & Diagrams
Camera Adapters Diagrams
- CDK20 IRF90 to Apogee Adapters
- CDK20 IRF90 to SBIG STX Adapters
- CDK20 to Apogee Adapters
- CDK20 to FLI Adapters
- CDK20 to SBIG Adapters
Software
Instructions
Helpful Tools
Warranty
Warranty
For warranty information please check our Standard Warranty Page.