Orion 8 f/8 Ritchey-Chretien Astrograph Telescope Review
Orion 8 f/8 Ritchey-Chretien Astrograph Telescope Review
Last Updated on Thursday, 8 July 2010 08:02 Written by admin Thursday, 8 July 2010 06:41
| User Information | |
|---|---|
| Pros | 0 |
| Cons | 0 |
Orion 8 f/8 Ritchey-Chretien Astrograph Telescope Review
PRICE:1,195.95
WARRANTY: One year
MANUFACTURER: Orion
The Orion 8″ Ritchey-Chretien Astrograph’s outstanding optical design lets you capture spectacular, detailed images of deep-sky objects like never before. Unlike conventional Newtonian reflector and Schmidt-Cassegrain designs that are susceptible to coma away from the center of the field, the Ritchey-Chretien utilizes hyperbolic primary and secondary mirrors, made of BK-7 optical glass, to achieve wonderfully flat-field images that are virtually coma-free. Images are also free from chromatic aberration, since there are no lenses. The Orion 8” Ritchey-Chretien Astrograph is ideal for use with small CCD-chip cameras such as our StarShoot line, as well as medium-format CCD and DSLR cameras. The telescope’s wide, fully illuminated flat field produces pinpoint star clarity all the way to the edge of the camera’s sensor. The Orion 8” Ritchey-Chretien Astrograph features a machined, dual-speed (10:1) Crayford-style focuser with an engraved millimeter scale on the drawtube. The secondary mirror is precisely center-marked to facilitate collimation. The 21-inch enameled steel optical tube weighs only 15.8 lbs. and features a Vixen-style dovetail mounting bar underneath, for trouble-free setup on medium or large-sized equatorial mounts. The inside of the optical tube is fortified with eight computer-positioned light baffles, and the primary mirror baffle tube and secondary mirror light shield are also highly baffled to ensure maximum image contrast. One-year limited warranty.
Use: Astronomy and terrestrial
User Level: Advanced
OPTICAL TUBE OTA SPECIFICATIONS
Aperture: 200mm
Focal Length: 1600mm
Focal Ratio: f/8
Optics Type: Hyperbolic
Glass Material:
Resolving Power: 0.58
Limiting Stellar Magnitude: 14.2
Tube Material:Steel
Optical Tube Length / Focal Length:21.8 in.
Optical Tube Weight:15.8 lbs.
OPTICAL MIRROR/LENS SPECIFICATIONS
Optical Design: [Optical Design]
Optical Quality: Diffraction limited
Secondary Mirror Obstruction: 48%
Secondary Obstruction: 23%
Mirror / Glass Coatings:
TELESCOPE MOUNT & GOTO SPECIFICATIONS
Tripod Material:
Mount Style: Optical Tube without Mount
Bearing Material:
Astroimaging Capability: Lunar, planetary and long exposure
Motor Drive Compatibility:
Computerized Compatibility:
Alignment Procedure:
Number Of Objects In Database:
Power Requirement:
Ports:
Tracking Rates:
Motor Type:
ACCESSORY SPECIFICATIONS
Finder:None
Focuser:2in. dual-speed linear bearing Crayford
KEYWORDS: 08958,8958,cassegrain, Ritchey-Chretien, telescope,coma-free, astrophotography, rc, RC, r c, R C
Great astrophotographers scope and plenty of aperture, only adds 15 lbs. to the mount but give you 8″ of aperture.