ThaiExcite

ThaiExcite
88/41 Kanlapapruek Road, Bangkae, Bangkae, 10160, Bangkok, ประเทศไทย
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URL: http://www.thaiexcite.com/GSO-8-f-12-Classical-Cassegrain-CC8-on-iOptron-CEM26-mount-AccuAlign-1.5-tripod.html

กล้องดูดาว GSO 8" f/12 Classical Cassegrain (CC8) บนเมาท์ iOptron CEM26 mount + AccuAlign + ขาตั้ง 1.5" tripod

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ผู้ผลิต
iOptron
จำนวนในสต๊อก
เหลือ 4 ชิ้น
น้ำหนัก
33,500.00 g
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฿84,990.00

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กล้องดูดาว GSO 8" f/12 Classical Cassegrain (CC8) บนเมาท์ iOptron CEM26 mount + AccuAlign + ขาตั้ง 1.5" tripod

 GSO CC8 on iOptron CEM26

 

A Modern Take on a Classic Telescope Design

First conceived in 1672, the classical Cassegrain telescope uses a parabolic primary mirror and a hyperbolic secondary mirror to fold a long focal length into a relatively compact open optical tube. This simple design is ideal for visual observations of the Moon, planets, double stars, planetary nebulae, compact globular clusters, and other objects that are well framed in the tighter fields of view that result from a long focal length.

 

GSO Classical Cassegrain Reflector

 

This 8” f/12 Cassegrain from GSO is a modern take on the classical Cassegrain design. With a focal length of 2436mm, it’s ideal for crisp and razor-sharp visual observation and imaging. This telescope offers views that rival apochromatic refractors at a tiny fraction of the price. Despite its long focal length, the optical tube of this telescope is just 21.1” (536mm) long, not including the focusers.

Compared to more complex Maksutov-Cassegrain designs, which include a thick and heavy corrector plate, this scope is not only far less expensive, it’s also much lighter, just 20bs, which matches well with nearly any mid-capacity altazimuth or equatorial mount. And unlike compound telescopes like Maksutov or Schmidt-Cassegrains, these telescopes have fixed mirrors so there’s no image shift during focusing, even at very high magnifications. And since they are purely reflecting telescopes, there is no chromatic aberration visible, even when observing bright objects.

 

Diffraction Limited Quartz Primary and Secondary Mirrors for Razor-Sharp Views

Both the parabolic primary and hyperbolic secondary mirrors are made from thermally-stable quartz and ground and polished to a surface accuracy that’s diffraction limited or better. Each mirror has enhanced aluminum coatings overcoated with a protective layer of quartz for long life. And each has a reflectivity of better than 96%, similar to Ritchey-Chretien, Schmidt-Cassegrain, and other scopes that cost far more. 

 

RC_collimation9

 

The secondary mirror is mounted in a four-vane spider, and the central obstruction is about 33%, comparable to most Schmidt-Cassegrain telescopes.

 

6-cassegrain.jpg-3_4

 

These telescopes are ideal for visual observation, but they can also be used for lunar and planetary imaging. While these telescopes do not exhibit spherical aberration, like Newtonians they will have some coma especially at the lowest magnifications or with astronomy cameras with large chips. 

 

Internal Light Baffles for High Contrast

Computer optimization results in eight contrast-enhancing glare-stop baffles in the optical tube as well as multiple glare-stop micro baffles in the secondary mirror light shield. The scope also includes four baffles in the primary mirror baffle tube, resulting in excellent dark sky backgrounds and extremely good image contrast.

 8-cassegrain-5

2” Dual-Speed Crayford Focuser and Accessories

The telescope comes with a 2” dual-speed Crayford focuser mounted to the M90x1 threads on the rear cell. There’s a coarse focusing knob on each side, and a single 10:1 fine focusing knob.

 

m-sct-focuser

 

The drawtube includes a non-marring soft brass compression ring to hold 2” accessories in place. An included 1.25” adapter, also with a non-marring compression ring, slips into the 2” focuser to hold 1.25” eyepieces or imaging accessories.

8-cassegrain-3_1

8-cassegrain-4_1

 

 

Open Metal Tube for Fast Temperature Equalization and Reduced Dew Formation

The black tube of this classical Cassegrain is made from rolled steel for good thermal stability and it's capped with end rings of die-cut aluminum for protection and rigidity. The scope includes a dust cap, a shoe for a finder scope, and Losmandy and Vixen-style dovetail rails for mounting.

 

6-cassegrain.jpg-4jpg_2

 

 

Because there’s no corrector plate on this classical Cassegrain design, the optics are far less susceptible to dewing, and they exhibit much faster temperature equalization because of the open optical tube. The absence of a corrector plate also means this telescope is ideal for imaging planets in the IR to pick up additional detail not seen at visible wavelengths.

 

Introducing iOptron’s new compact next-generation center-balance equatorial mounts the CEM26!

iOptron CEM26 C261B1-2

 

 

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)

  

Shows polar alignment without seeing Polaris using iOptron iPolar:

 

 

The GSO 8" f/12 Classical Cassegrain as a good telescope for lunar and planetary astrophotography

 

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/12 Classical Cassegrain (CC8)

GSO CC8 astrophotos
Credit: Astrobin

 

Other included accessories:

A star diagonal, two eyepieces: One 25mm and one 9mm fully multicoated high power 1.25”  52° field Plössl eyepieces. Three extension tubes for reaching focus with different accessories. Can be expanded by adding more accessories (eyepieces, filters, barlows, astrophotography adapters, etc.).

GSO 1.25-inch 90-degree Star Diagonal resize 50GSO Super Plossl 9mm eyepiece สำหรับกล้องดูดาว/GSO Super Plossl 25mm eyepiece

The scope also comes with adapter rings to help achieve focus in a wide range of visual and imaging configurations.

 

 GSO 8-inch Ritchey-Chretien Astrograph focus extension rings

 

 

GSO 8" f/12 Classical Cassegrain (CC8) OTA SPECIFICATIONS

Best for viewing Lunar & planetary
Best for imaging Lunar & planetary
User level Advanced
Optical design Classical Cassegrain
Optical diameter 203mm
Focal length 2436mm
Focal ratio f/12
Optics type Parabolic
Eyepieces 9mm (1.25") and 25mm (1.25") eyepieces
Magnification with included eyepieces 97x and 270x
Resolving power 0.58arc*sec
Highest useful magnification 236x
Highest theoretical magnification 400x
Limiting stellar magnitude 14.2
Optical quality Diffraction limited
Finder scope 8x50mm
Focuser 2" Dual-speed Crayford
Secondary mirror obstruction 68mm
Secondary mirror obstruction by diameter 34%
Secondary mirror obstruction by area 12%
Mirror coatings/over-coatings Low Thermal Expansion Quartz
Tube material Steel
Length of optical tube 25in. 
Weight, optical tube 18.2 lbs.

 

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

 

SUPPORT DOCUMENTS

GSO CC Manual:
GSO Classical Cassegrain Telescope Manual (by Orion)

Note: The above manual is made by Orion Telescopes. As the scopes are manufactured by GSO, 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 8-inch Ritchey-Chretien Astrograph OTA box size

 


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!