Carbon 20 inch f/8.1 Ritchey-Chrétien...

20 inch Ritchey-Chretien

RCOS Carbon 20RC shown here on a Paramount ME (not included).


20 inch (0.51 meter) RC Specifications
  • 20 inch f/8.1 Ritchey-Chretien Zero Expansion Astro-Sitall Optics by Star Instruments certified to 1/4 wave P-V and 1/25 wave RMS or better.
  • Fringe analysis and interferometric data supplied with each optical set.
  • Enhanced Aluminum (SiO2/TiO2) overcoat - 96.9% reflectivity.
  • Low Expansion, light weight Carbon Fiber Tube for superior performance and stability.
  • 6061 and 7075 Aluminum components - All CNC Machined.
  • Precision Secondary Mirror Focuser.
  • 2-Stage Primary mirror baffle with internal knife-edge light stops.
  • Secondary light baffle.
  • 6061 Aluminum Mounting Rings - CNC Machined.
  • 6061 Aluminum End Ring - CNC Machined.
  • Active Cooling.
  • RCOS "Focus and Forget" Technology.
  • Shipped fully assembled, collimated, and ready to use.
  • RCOS Custom CNC Machined "light weight" Losmandy compatible dovetail plates - top and bottom with matching Paramount VersaPlate hole pattern, allows dovetail mounting plate to be bolted to VersaPlate once scope is balanced.
  • Losmandy RDF-90 Finder Scope 3-point mounting bracket.
  • Large Format (4.75" clear aperture) Fixed Instruments Adapter Set - FIALF.
  • Built in carbon dew shield.
  • Tube end ring (aluminum).
  • CNC machined dust cap.
 System 20" f/8.1
Focal Length 4115mm
Base Price $59,730
Delivery Status 45-60 Days Upon Receipt of Optics
Back Focus 15"
Carbon Tube Length/Diameter 58"/24.8"
Primary Focal Length 60"
Primary Hole 4.5"
Primary to Secondary Spacing 39.70"
Radius of Field Curvature 21.74"
Secondary Amplification 2.70X
Secondary Size 7.60"
Total Weight* 160 pounds

*100% ready for imaging as equipped above including mounting rings and dovetail plates.

Recommended Options
RCOS Precision Instrument Rotator (PIR). Controlled by the Telescope Command Center.
$2,450
RCOS Large Format Precision Instrument Rotator (PIRLF). Controlled by the Telescope Command Center.
TBD
RCOS Telescope Command Center (TCC) - Thermal monitor of primary, secondary and ambient air temperature, includes and controls fans, secondary focus position, secondary dew heater operation, and operation of optional Instrument Rotator . Includes Servo DC motor to electronically operate the secondary focuser.
$1,850

Mini Borg 45 ED f/6.6 Refractor for Finder Scope (Mini45).
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Mini Borg 50 Ach f/5 Refractor for Finder Scope (Mini50).
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Borg 77mm ED Refractor for Piggy back Guide Scope, Finder Scope, or Wide Field Imager (77ED).
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Borg 100mm ED Refractor F4/F6.4 PH for Piggy back Guide Scope, or Wide Field Imager (100ED).
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FSQ-106 by Takahashi (FSQ-106).
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RCOS Custom Shipping Crate
$850

 

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