กล้องดูดาว GSO 8" f/8 Ritchey-Chrétien (RC8) บนเมาท์ iOptron CEM26 mount + AccuAlign + ขาตั้ง 1.5" tripod
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.
Please Note: The Orion 8" RC in the video above is manufactured by GSO and has identical specifications and features.
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 aluminium 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.
Introducing iOptron’s new compact next-generation center-balance equatorial mounts the CEM26! |
| Best for viewing | Deep sky |
| Best for imaging | Deep sky |
| User level | Advanced |
| Optical design | Ritchey-Chrétien |
| Optical diameter | 203mm |
| Focal length | 1600mm |
| Focal ratio | f/8 |
| Optics type | Hyperbolic |
| Eyepieces- | Optional 1.25" or 2" eyepieces supported |
| Magnification with included eyepieces | - |
| Resolving power | 0.58arc*sec |
| Highest useful magnification | 236x |
| Highest theoretical magnification | 400x |
| Limiting stellar magnitude | 14.2 |
| Optical quality | Diffraction limited |
| Finder scope | Optional |
| 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 | Low Thermal Expansion Quartz |
| Tube material | Steel |
| Length of optical tube | 22in. (559mm) |
| Weight, optical tube | 18.5 lbs. (8.4kg) |
CEM26 MOUNT SPECIFICATIONS
| Mount | Center-Balanced Equatorial Mount |
| Payload * | 26 lbs (12kg), exclude counterweight |
| Mount weight | 10 lbs (4.5kg) |
| Payload/Mount weight | 2.6 |
| Structure Material | All metal, Casting + CNC machined |
| Exterior Finish | Powder coating |
| Periodic error (PE) ** | <±10 arcsec |
| PEC | Yes, Permanent PEC |
| Worm period | 600 sec |
| Right Ascension worm wheel | Φ88mm, 144 teeth aluminum |
| Declination worm wheel | Φ88mm, 144 teeth aluminum |
| Right Ascension axis shaft | Φ35mm steel |
| Declination axis shaft | Φ35mm steel |
| Right Ascension bearing | Φ55mm ball bearing |
| Declination bearing | Φ55mm ball bearing |
| Worm gears | Φ15.2mm, Brass |
| Motor drive | 1.8º stepper motor, 128X microdivision |
| Resolution | 0.17 arc seconds |
| Transmission | Synchronous belt |
| Latitude adjustment range | 0º ~ 60º |
| Azimuth adjustment range | ± 6º |
| Polar Scope | AccuAlignTM optical polar scope or iPolar (depends on option) |
| Level indicator | Level bubble |
| Hand Controller | Go2Nova® 8409 with ~212,000 objects database |
| Tracking | Automatic |
| Slew speed | 1×,2×,8×,16×,64×,128×,256×,512×,MAX(6º/sec) |
| Power consumption | 0.5A(Tracking), 0.8A(GOTO) |
| Power requiremention | 12V DC, 5A |
| AC adapter | 100V ~ 240V (included) |
| Power-down memory | Yes |
| Wi-Fi | Built-in |
| Communication port | Yes (Wi-Fi and USB) |
| Autoguide port | Yes (ST-4 compatible) |
| Firmware upgrade | Yes |
| PC computer control | Yes (ASCOM) |
| Counterweight shaft | Φ20X306mm (M16), Stainless Steel |
| Counterweight | 10 lbs (4.5kg) |
| Tripod | 1.5" (5kg) or LiteRoc 1.75" (7.5kg) heavy duty stainless steel |
| Dovetail saddle | 3.8" Vixen-style, center adjustable |
| GPS | Optional external 32-channel GPS |
| Autoguiding | Optional external iGuider 1 |
| Operation temperature | -10ºC ~ 40ºC |
| Warranty | Two year limited |
* OTA size and length dependent
** Measured with encoder, 10 minutes
GSO RC Manual:
GSO Ritchey-Chretien Telescope Manual (by iOptron)
Note: The above GSO RC Manual is made by iOptron for their Phtron series RC telescopes. Other than cdifferent color and logo, almost all aspects of the telescope OTA and accessories are the same.
CEM26 Manual:
Quick Start Guide
Instruction Manual
Firmware:
Download Latest Firmware
iOptron Telescope ASCOM Driver:
Install ASCOM Driver and Commander

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!













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