RC Optical Systems - 20 inch Truss Ritchey-Chretien

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

RCOS 20 inch Truss Telescope currently in use at Kitt Peak National Observatory (NOAO).

RCOS 20 inch Truss Telescope currently in use at Kitt Peak National Observatory (NOAO) shown with optional "Shortie" Light Shroud.

20 inch Ion Milled optics arriving as of Dec 2007!

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 Truss tubes for superior performance and stability. RCOS "Focus and Forget" Technology. Shipped fully assembled, collimated, and ready to use. 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 Secondary Support Ring - CNC Machined. Active Cooling. 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. CNC Machined composite dust cover for primary mirror.	System	20" f/8.1
	Focal Length	4115mm
	Base Price	$54,300
	Delivery Status	45-60 Days Upon Receipt of Optics
	Back Focus	15"
	Carbon Truss Tube Length/Diameter	50"/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).	Call
Mini Borg 50 Ach f/5 Refractor for Finder Scope (Mini50).	Call
Borg 77mm ED Refractor for Piggy back Guide Scope, Finder Scope, or Wide Field Imager (77ED).	Call
Borg 100mm ED Refractor F4/F6.4 PH for Piggy back Guide Scope, or Wide Field Imager (100ED).	Call
FSQ-106 by Takahashi (FSQ-106).	Call
RCOS Custom Shipping Crate	$850

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RC Optical Systems, Inc. An Arizona Corporation
1650 South Plaza Way, Suite 101, Flagstaff, AZ 86001, 928-526-5380
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