RC Optical Systems 32 inch F/8 Ritchey-Chretien Carbon Truss
[RCOS_32RCT]

32 inch (81cm) F8 Ritchey-Chrétien met carbon Truss buis van RC Optical Systems. Amateurs go PRO!

Niet voor niets kiezen topfotografen als Russel Croman, Tony Hallas en Robert Gendler voor RCOS Ritchey-Chrétien telescopen.

A Ritchey-Chrétien is a specialized Cassegrain reflector utilizing true hyperbolic surfaces. All reflectors typically have an aberration called coma - all except for the Ritchey-Chrétien. The hyperbolic mirrors of the Ritchey-Chrétien make this design coma free, which results in a much smaller spot size. This is the #1 reason why nearly all professional observatories have chosen the Ritchey-Chrétien design.

Since Ritchey-Chrétien optics are two mirror optical systems, they have no Spectral Dispersion or Chromatic Aberration. Chromatic Aberrations are common in Catadioptric Systems and caused by their refractive element known as a "corrector plate". See diagrams of Chromatic Aberration on and off axis in a Catadioptric system.

In addition to being coma free and chromatic free, a true Ritchey-Chrétien offers:

• Only two surfaces for less light loss - Catadioptric type optics have 4 surfaces (two are glass!) . Some APO's have 6 surfaces. Each surface degrades the amount of light getting to the focal point.
• No refractive elements - Glass scatters light, especially in IR where CCD cameras are most sensitive. A Ritchey-Chrétien has no refractive elements, such as a corrector plate.
• Flatter Field - The lower the amplification factor of the secondary mirror, the flatter the field. For example, the RC has a 2.7x secondary, whereas, a Schmidt-Cassegrain has a 5x secondary. The RC has a much flatter field!
• Smaller Spot Size on and off axis. Examine this spot diagram to see the difference!
  

For these reasons, the Ritchey-Chrétien is ideal for medium to large format CCD or film photography, where a large aberration-free field of view is required. It is also a superb visual instrument.

RC Optical Systems 32 inch (81cm) F8 Ritchey-Chrétien Carbon Truss:

• System: Custom 32RC;
  
• Order Status: Open;
• Back Focus: User Defined;
• Carbon Tube Length/Diameter: Custom;
• Primary Focal Length: F/1.5 - f/3;
• Primary Hole: 7.875";
• 32 inch Ritchey-Chrétien - Astro-Sitall (zero expansion) Glass Ceramic Optics certified to 1/20 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 Stainless Steel Truss for superior performance and stability;
• Carbon fiber metering tubes for maintaining mirror spacing;
• RCOS Telescope Command Center (TCC) Controller - thermal monitor, controls fans, secondary focus position, instrument rotation, and secondary dew heater. Included Servo;
• 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;
• RCOS "Focus and Forget" Technology;
• CNC Machined "light weight" mounting plates - top and bottom;
• Losmandy RDF-90 Finder Scope 3-point mounting bracket;
• Fixed Instruments (rear cell) Adapter Set - FIA;
• 2-Stage Primary mirror baffle with internal knife-edge light stops;
• Conical Secondary light baffle.