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!
iOptron CEM26 quiet slewing at MAX speed of 6º/sec:
Like their predecessors, the CEM26 is designed with portability in mind, weighing in at only 10 lbs it can support up to a 26lb payload an incredible 2.6 mount weight to payload ratio. The key to enable such ratios is the CEM design focuses the mount and payload weight directly on the center of the tripod rendering “natural stability”.
Building on the legacy of earlier CEM models we have added features for convenience and functionality. A positive lock gear engagement system (easy to use even when wearing gloves), Built-in Wi-Fi enabling unparallel connectivity and recordable permanent periodic error correction (PPEC) to repeat optimal PEC training sessions. Regarding functionality the CEM26 delivers precise pointing and accurate tracking. The CEM26 sets the new standard for compact equatorial mounts.
The center-balanced design mount puts the weight of the payload at the center of gravity allowing for greater natural stability. Other features include an adjustable counterweight bar to prevent obstruction with the tripod. And polar aligning is quick and accessible all the time since the polar scope is not blocked by the declination shaft.
The CEM26 is equipped with the latest advanced GOTONOVA® GOTO technology, making it one of the most powerful and accurate GOTO mounts available. Its database includes over 212,000+ objects. The Go2Nova® Hand Controller is intuitive to use and its large 4-line LCD screen simplifies the process of setting telescopes and locating objects.
The CEM26 mount either has an AccuAlignTM optical polar scope or an integrated electronic polar finder scope known as the iPolar (depending on option). iPolar ensures the accurate alignment of a telescope, even when the pole star is obscured.
iOptron iPolarTM - the smart electronic polarscope for everyone (Optional)
Fast and easy to use
High precision (30 arcsec)
No need to see the Pole Star
No need to rotate the mount during alignment
Unique imaging enhancement technique
Smart plate solving
On screen instruction during alignment
Capable under poor sky visibility condition
Shows polar alignment without seeing Polaris using iOptron iPolar:
The GSO 8" f/8 Ritchey-Chrétien is a good telescope for astrophotography
The GSO 8" f/8 Ritchey-Chrétien (RC6) is ready for astrophotography with many good features for beautiful astrophotos.
2" Dual-speed Crayford focuser with Linear Bearing mechanism for extra support of heavy astrophotography equipment
Hyperbolic mirror that produce flat, sharp images with virtually no false color or coma
Computer-optimized light baffles in main tube, primary and secondary mirror light shield, providing high contrast images
No moving mirror parts resulting in a stable image while tracking an object across the sky
Mirrors made of low thermal expansion quartz, enhanced aluminium coatings on both primay and secondary mirrors with 96% reflectivity
Actual astrophotos taken from the GSO 8" f/8 Ritchey-Chrétien (RC8)
Credit: Astrobin
Other included accessories:
Three extension tube for reaching focus with different accessories. Can be expanded by adding more accessories (eyepieces, filters, barlows, astrophotography adapters, etc.).
GSO 8" f/8 Ritchey-Chrétien (RC8) OTA SPECIFICATIONS
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
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.
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!
- Material: Plastic + metal nut
- Specially designed for iPhone 4
- Allows your iPhone 4 use a standard tripod with it
- Also can be used as a stand holder
- Provides best view angle for watching movie, playing game,
etc. - A great accessory for your iPhone 4
The dovetail groove is designed for ASIAIR PLUS to connect Vixen dovetail plate. It can help achieve more convenient and flexible installation methods compared to the original dovetail plate of ASIAIR PLUS.
For filter wheels that accept 36mm unmounted filters
Compatible with ZWO/QHY/SBIG 36mm electronic filter wheel
Suitable for DSLR, webcams, CCD cameras, planetary cameras, black-and-white camera for bright-field shooting
Long-lasting: made with multi-coated glass with an ion-assisted deposition technology to ensure scratch resistance and stability on the central wavelength
Improve image sharpness, blocks ultraviolet and infrared transmissions but lets visible spectrum through
comes with a plastic case With high pressure EVA case lining
Quickly capture dark frames to optimize photo quality
Opaque - blocks all light from the imaging camera sensor. Help remove dark currents - essential for astrophotography
Easily eliminate camera noise and hot pixels
Dark frame acquisition helps remedy such noise and "hot pixels" by canceling out these disruptive effects during image processing
Threaded and can be directly connected to your filter wheelfor fast conversion between different filters;
Made of metal for durability. High quality packing box includes foam-lined plastic case