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.
This 6” f/12 Cassegrain from GSO is a modern take on the classical Cassegrain design. With a focal length of 1836mm, 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 17.2” (437mm) 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 under 14lbs, which matches well with nearly any mid-capacity altazimuth or equatorial mount. Unlike compound telescopes like Maksutov or Schmidt-Cassegrains, these telescopes have fixed mirrors so there’s no image shift or mirror flop 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.
The secondary mirror is mounted in a four-vane spider, and the central obstruction is about 33%, comparable to most Schmidt-Cassegrain telescopes.
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.
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.
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.
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 a Vixen-style dovetail rail for mounting.
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 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 6" f/12 Classical Cassegrain as a good telescope for lunar and planetary astrophotography
The GSO 6" f/12 (CC6) is ready for astrophotography with many good features for beautiful astrophotos.
2" Dual-speed Crayford focuser with precise movement also suitable for heavy cameras
f/12 focal ratio (focal length of 1836mm) makes for convenient lunar and planetary astrophotography
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
Actual astrophotos taken from the GSO 6" f/12 Classical Cassegrain (CC6)
Credit: Astrobin
Other included accessories:
Two eyepieces: One 25mm and one 9mm fully multicoated high power 1.25” 52° field Plössl eyepieces. Three extension tube for reaching focus with different accessories. Can be expanded by adding more accessories (eyepieces, filters, barlows, astrophotography adapters, etc.).
The scope also comes with 1” and 2” adapter rings to help achieve focus in a wide range of visual and imaging configurations.
GSO 6" f/12 Classical Cassegrain (CC6) OTA SPECIFICATIONS
Best for viewing
Brighter Deep sky
Best for imaging
Deep sky
User level
Advanced
Optical design
Classical Cassegrain
Optical diameter
152mm
Focal length
1836mm
Focal ratio
f/12
Optics type
Parabolic
Eyepieces
9mm (1.25") and 25mm (1.25") eyepieces
Magnification with included eyepieces
73x and 204x
Resolving power
0.77arc*sec
Highest useful magnification
180x
Highest theoretical magnification
300x
Limiting stellar magnitude
13.6
Optical quality
Diffraction limited
Finder scope
6x30mm
Focuser
2" Dual-speed Precision Crayford
Secondary mirror obstruction
58mm
Mirror coatings/over-coatings
Aluminum & Silicon Dioxide (Quartz)
Tube material
Steel
Length of optical tube
17.2in.
Weight, optical tube
13 lbs 14 oz
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 Orion. These are GSO-made scopes. Other than cdifferent color and logo, almost all aspects of the telescope OTA features 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
1.25" stainless steel tripod that fits all SmartStar Cube and Cube Pro series mounts. Allows mount to be positioned in either altazimuth (AA) or equatorial(EQ) positions.
A proper Go2Nova hand controller is needed to function the mount in both AA and EQ.
A very well made and easy to use smart telescope, ideal for someone like me who is new to astro-photography. I found it very easy to connect with my smart phone and was able to take my first solar photo within a few minutes. I am still waiting for some clear skies before trying out the stargazing mode.