- Telescope System: Optical Tube Only (OTA)
- Telescope type: Astrograph, Ritchey Chretien (RC)
- Telescope brand: RC Optical Systems
- Telescope Aperture (Range): 300mm - 499mm
16 inch (41cm) F8.4 Ritchey-Chrétien met carbon 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 16 inch (41cm) F/8.4 Ritchey-Chrétien Carbon:
- System: 16" F/8.4;
- Focal Length: 3414mm;
- Delivery Status: 45-60 Days Upon Receipt of Optics;
- Back Focus: 14";
- Carbon Tube Length/Diameter: 49"/19";
- Primary Focal Length: 48";
- Primary Hole: 4.0";
- Primary to Secondary Spacing: 31.7";
- Radius of Field Curvature: 17.67";
- Secondary Amplification: 2.8X;
- Secondary Size: 6.00";
- Total Weight*: 87 pounds;
- 16 inch F/8.4 Ritchey-Chrétien Zero Expansion Astro-Sitall Optics by Star Instruments certified to at least 1/25 RMS;
- 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 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;
- Built in carbon dew shield;
- Fixed Instruments (rear cell) Adapter Set - FIA;
- Tube end ring (aluminum);
- CNC machined dust cap.
- Telescope System
- Optical Tube Only (OTA)
- Telescope type
Ritchey Chretien (RC)
- Telescope Aperture (mm)