ThaiExcite
88/41 Kanlapapruek Road, Bangkae, Bangkae, 10160, Bangkok, ประเทศไทย
ติดต่อสอบถาม: 081-239-3299
อีเมล์: info@thaiexcite.com
URL: http://www.thaiexcite.com/GSO-6-f-9-Ritchey-Chretien-Telescope-OTA-with-2-Dual-speed-Crayford-Focuser-SKU8308RC06F9MW1.html
โปรดทราบ: กล้อง Orion 8" RC ในวีดีโอรุ่นนี้ผลิตโดย GSO ซื้อเวอร์ชั่น GSO เองที่ไม่มีโลโก Orion จะช่วยคุณประหยัดไปได้เป็นหมื่นบาททีเดียว!
Capture exceptional images of night sky wonders with the GSO 8" Ritchey-Chrétien Astrograph. This true astrograph is optimized for astrophotographic use with APS-C and 35mm CCD cameras and DSLRs. With several key advantages over Schmidt-Cassegrains and other imaging telescopes, this 8" Ritchey-Chrétien, or "RC", is a remarkable telescope that delivers amazing, flat-field images which are virtually coma-free to the edge of the fully illuminated field.
This 8" (203mm) aperture RC combines the highly regarded Ritchey-Chrétien optical design with excellent light-gathering capability, high-end features, and durable construction to provide astrophotographers with an exceptional instrument at an amazing value. Unlike conventional Newtonian reflector and Schmidt-Cassegrain designs that are susceptible to coma away from the center of the field, the GSO 8" Ritchey-Chrétien Astrograph optical tube utilizes hyperbolic primary and secondary mirrors, made of low-expansion quartz glass, to achieve wonderfully flat-field images that are virtually devoid of coma with pinpoint star clarity. Plus, since there are no lenses in an RC telescope, captured images are delightfully free of chromatic aberrations for true-color performance.
The enameled steel GSO 8" Ritchey-Chrétien optical tube is fortified with 9 internal, computer-positioned knife-edge light baffles; and both the primary mirror tube and secondary mirror light shield are highly baffled to ensure maximum image contrast for bright images rich in detail. Unlike Schmidt-Cassegrains, the primary mirror of the 8" Ritchey-Chrétien telescope is fixed in-place to eliminate annoying "image shift" that can wreak havoc during imaging sessions. Enhanced aluminum coatings on both the primary and secondary mirrors of the 8" Ritchey-Chrétien Astrograph provide 96% reflectivity with a protective quartz overcoat. Designed with collimation in mind, the secondary mirror of the 8" RC is precisely center-marked to facilitate collimation adjustments should they become necessary.
The GSO 8" RC Astrograph features a machined, dual-speed (10:1) Crayford focuser equipped with a sturdy linear-bearing mechanism for enhanced rigidity and stable support of heavy astrophotography equipment. The rock-solid focuser provides 140.7mm of backfocus travel (238.1mm from the rear cell) to easily accommodate imaging accessory trains, and an engraved millimeter scale on the drawtube enables easy focus point repeatability. One 2" and two 1" machined focus extension rings are included so you can adjust focus position for various imaging cameras and accessories. A dovetail finder scope base allows easy installation of optional Mini Guide Scopes and aiming devices (sold separately). The 8" Ritchey-Chrétien tips the scales at 18.5 lbs. and is equipped with a wide "Losmandy-style" dovetail bar along its underside for easy attachment to large equatorial mounts. A unique, narrow dovetail bar along the top of the telescope allows easy attachment of optional guide scopes and other imaging accessories.
The GSO 8" f/8 Ritchey-Chrétien (RC6) is ready for astrophotography with many good features for beautiful astrophotos.
Actual astrophotos taken from the GSO 8" f/8 Ritchey-Chrétien (RC8)
Credit: Astrobin
Best for viewing | Deep sky |
Best for imaging | Deep Sky |
User level | Advanced |
Optical design | Ritchey-Chretien |
Optical diameter | 203mm |
Focal length | 1600mm |
Focal ratio | f/8.0 |
Optics type | Hyperbolic |
Eyepieces | None |
Resolving power | 0.58arc*sec |
Lowest useful magnification | 29x |
Highest useful magnification | 236x |
Highest theoretical magnification | 400x |
Limiting stellar magnitude | 14.2 |
Optical quality | Diffraction limited |
Finder scope | None |
Focuser | 2" Dual-Speed Linear bearing Crayford |
Secondary mirror obstruction | 95mm |
Secondary mirror obstruction by diameter | 47% |
Secondary mirror obstruction by area | 22% |
Mirror coatings/over-coatings | Multi-coated with 99% Dielectric Coatings & Low Thermal Expansion Quartz |
Mount type | OTA without mount |
Tube material | Steel |
Length of optical tube | 22.0 in. (559mm) |
Weight, optical tube | 18.5 lbs. (8.4kg) |
Additional included accessories | 2" to 1.25" adapter, extension tube rings for achieving focus with different accessory configurations |
Warranty | One year |
คู่มือ:
GSO Ritchey-Chretien Telescope Manual (written by Orion)
GSO Ritchey-Chretien Telescope Manual (written by iOptron)
หมายเหตุ:
- กระบอก iOptron และ Orion ตามคู่มือผลิตโดยโรงงาน GSO ต่างกันเพียงแค่สี โลโก และ Orion มี dovetail เพิ่มเติมบนกระบอก ส่วนสเปคและอุปกรณ์เสริมเหมือนกันทุกประการ
- คู่มือเป็นของ Orion/iOptron สำหรับ RC series รวมทุกขนาด จึงอาจมีรายละเอียดที่เป็นเฉพาะของแต่ละขนาด ดูรายละเอียดได้จากหน้า spec sheet ในคู่มือ
GSO is a leader in optical telescopes and accessories and their products have been sold for years by the "Big Three" (Meade, Celestron and Orion) under their own brand names. GSO telescopes and accessories are also sold under different names world-wide; Zhumell (USA), Apertura (USA), TPO (USA), Teleskop Service (Germany), Sky Optic (France), Antares (Canada), Astronz (New Zealand), and more than a dozen more brands too many to name. GSO is known for their high consistency in quality control, low defect rate, and their Taiwanese-based manufacturing scores closer to Japan in quality than other telescope manufacturers which mostly manfacture thier scopes in Mainland China. Give these telescopes a try - you will not be disappointed!