Specifications
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Description
The AG Optical Systems .5 meter (20 inch) F6.7 Imaging Dall Kirkham (iDK) telescope is an observatory-class imaging instrument featuring an 70mm flat field imaging circle free from coma, astigmatism, and field curvature. The outstanding optical performance of the 20″ iDK is made possible through the convergence of careful design, state-of-the-art manufacturing, and precise assembly. Wide field images are captured with high-contrast details and sharp stars across the entire field of view.
The AG Optical Systems 20″ iDK F6.7 optical system provides exceptional thermal stability. Optical grade fused quartz optics ensure the figure and focus stability of the 20″ iDK as the temperature changes over the course of an imaging session. When combined with the rigid, thermally stable carbon fiber truss tube assembly of the 20″ iDK you can expect to spend less time focusing and more time collecting data.
AG Optical Systems iDK series carbon fiber truss optical tube assemblies make extensive use of carbon fiber composite materials, CNC-machined components, and precision collimation adjustments to provide a rigid and thermally stable platform for the low expansion optics. Two cooling fans speed the cooling of the primary mirror while primary and secondary mirror heaters can be automatically controlled by the optional Thermal Control System (TCS).
The optional, robust, digital Optec Gemini rotating focuser or Optec TCF-S3i focuser is ASCOM-compatible is capable of precision focusing and rotation while carrying heavy CCD imaging trains.
Optical Tube Assembly
- 140 lbs. carbon fiber tube assembly
- Tube length: 47 inches
- 20″ (.5m) optical grade fused quartz F6.7 optical system
- 70mm corrected imaged circle. 1.2 degrees
- Cooling fans, heaters, and temperature sensors
- Optional Thermal Control System
- Dust covers
- All CNC components, all stainless steel fasteners
Truss Shroud
Heavy Lycra shroud to block stray light, mitigate dust intrusion
Item #: FA20SHROUD
Price: $225
Optec Gemini 3.75″ Rotating Focuser
Low profile (2.5″), rotating digital focuser with 20 lbs payload capacity, temperature compensation feature
Item #: GEMINI
Price: $3495
Optec TCF-S3 3″ Digital Focuser
Robust, digital 3″ focuser with temperature compensation, FocusLynx control
Item #: TCFS31
Price: $1795
Included Items
- Carbon fiber optical truss tube assembly
- Losmandy “D” mount dovetail
- Primary and secondary dust covers
- Primary mirror cooling fans with power cable
- Primary and secondary mirror heaters and temperature sensors
- Low expansion substrate optics with enhanced aluminum coatings
- All stainless steel fasteners and springs
- Backplate carrying handles
20″ Imaging Dall Kirkham Spot Diagram
- .425 through .7 micron wavelength (LRGB)
- 10 micron pixel
- 70mm image circle (on-axis to 35mm off-axis)
