Manufacturer: Celestron
Product number: CE823069

EUR 4.699,00


incl. 19 % VAT (DE)  
The VAT indicated refers to that applicable in Germany. After logging in, the VAT amount is adjusted to the applicable VAT of the stored delivery country. Therefore, the final price may vary accordingly.
excl. 45.95 € shipping costs (DE)  
Please log in to calculate shipping costs to your country.
more details to the shipping costs ...

  • On stock
  • Only 1 pcs left in stock





There are no reviews for this product
  • Details..
  • Technical data..
  • In the box..
  • Reviews..
Celestron CGEM II 700 Maksutov-Cassegrain on GoTo-Mount
The 700 Maksutov-Cassegrain CGEM II telescope (CGEM II 700 Mak) is a specialized instrument designed for detailed, high contrast views of smaller celestial objects like the planets. With the Maksutov-Cassegrain optical tube and sturdy equatorial mount and tripod, this kit will provide unparalleled views of the planets and up-close views of the lunar surface, including craters and maria, Maks are also well suited to hunting smaller, fainter, deep sky objects such as globular clusters and planetary nebulae. Astronomers located in urban areas will appreciate the Mak’s ability to bring out more contrast in celestial objects. Transporting the entire system to a dark site is not a problem either. The telescope disassembles, with no tools required, into separate manageable pieces: optical tube, mount head, tripod, counterweight bar, counterweight, hand controller, tripod and accessory plate.

Maksutov-Cassegrain Optical Design
The Mak is a catadioptric telescope, which means the optical design includes both a lens and a mirror. The light coming through a Mak passes through the corrector lens to the primary mirror and back to a spherical secondary mirror before it hits your eyepiece. Images are bright, sharp, and virtually free of chromatic aberration.




The Maksutov-Cassegrain’s optical design offers several unique benefits. Instead of a secondary mirror, the Mak features a “secondary spot” of reflective coating applied directly to the inside of the corrector plate. Because of this, the telescope does not require frequent collimation like a Schmidt-Cassegrain. Also, the secondary spot is significantly smaller than a traditional Schmidt-Cassegrain secondary mirror, giving the Mak its signature high-contrast views.

One important thing to note about Maksutov-Cassegrain telescopes is that the larger, heavier Maksutov corrector plate takes longer to cool down and adjust to ambient air temperature compared to a Schmidt-Cassegrain of the same aperture.

CGEM II Mount & Tripod
CGEM II is a sturdy equatorial mount capable of rigidly supporting the 700 Mak. Its 40 lbs load capacity can handle the 19 lbs optical tube with ease, leaving lots of capacity to spare for your camera and any accessories. The heavy-duty adjustable height tripod has 2” diameter steel tripod legs with graduated markings that make it easy to extend the legs to the same height. The 700 Mak connects directly to the CGEM II with its CGE dovetail mounting bar.

The mount is packed with functionality and conveniences that make imaging with the 700 Mak easy. The fully computerized mount will automatically “GoTo” any of the 40,000+ astronomical objects selected from the NexStar+ hand controller’s database and automatically track the object as it appears to move across the night sky.

Designed with imaging in mind, the CGEM II motor drive system accurately tracks during an exposure. At the heart of the system are low cog DC servo motors with integrated optical encoders. The low cog design helps the motors run smoothly, while the integrated optical encoders provide accuracy. The motors turn steel worm gears, which are supported by precision bearings, against brass worm wheels. These components also help to make the motor drive system operate smoothly and accurately.

To track objects in the night sky, the mount must first be polar-aligned. Celestron makes this process easier than ever with the innovative All-Star Polar Alignment procedure. No extra equipment, such as a polar finder scope, is required. (An optional polar alignment finder scope is available if desired.) Best of all, the alignment can usually be completed in about 15 minutes, even without a clear view of Polaris.

All mounts have some amount of “periodic tracking error” inherent in them caused by tiny gear imperfections. To mitigate this, the CGEM II has Permanent Periodic Error Correction (PPEC). This allows you to run a routine to record the periodic errors only once; the recording is kept in memory, and subsequently corrects for the mount’s periodic tracking error. If an even higher level of tracking accuracy is desired, the CGEM II also has a dedicated autoguider port to connect an autoguiding camera directly to the mount to correct for any residual tracking errors.

Conditions for imaging are best when celestial objects are at their highest point in the sky with the darkest background, called the meridian. But some German equatorial mounts have trouble tracking near the meridian because they need to perform a “meridian flip,” readjusting their position to avoid the tube striking the mount. CGEM II does not suffer from this problem, imaging through the meridian with ease and not requiring a meridian flip until the object is a full 20° past the meridian.

The NexStar+ also has dozens of other functions to control every aspect of the mount’s behavior. These include:
Multiple ways to align the mount to the night sky
Adjustable slew rates up to 5°/second
Northern or Southern hemisphere compatibility
Adjustable autoguiding rates
Hibernate mode so the mount can be powered down without loss of alignment
Continual firmware development, with new features added regularly


In addition to the autoguider port, the CGEM II also has other ports to enhance and expand the capabilities of the mount. The hand controller has a USB 2.0 port for those who wish to control the mount with an external computer and optional third-party software. There is an AUX port on the mount that can support optional accessories such as StarSense AutoAlign.

When imaging, cable management can be a problem. The camera has a cable, the mount’s power source has a cable, and additional cables can come from a computer connection and augtoguider. To minimize cable management issues and prevent unwanted snags, all cabling for the mount is housed internally. This also eliminates the need to connect or disconnect an external Dec. motor cable when the mount is set up or broken down.

Accessories Included
The CGEM II 700 Mak comes complete with a 2” visual back, a 2” star diagonal with 1.25” adapter, a 28 mm wide-field 2” eyepiece, and a large 8x50 straight-through finderscope. The optical tube accommodates the larger 2” accessories, such as 2” Barlow lenses, the 2” eyepiece and filter kit, and larger wide-field eyepieces.

StarBright XLT Technology
StarBright XLT is Celestron’s revolutionary optical coating system that outperforms any other coating in the commercial telescope market. There are three major components that make up their StarBright XLT high-transmission optical system design:
Unique enhanced multi-layer mirror coatings made from precise layers of aluminum, SiO2 (quartz), TiO2 (titanium dioxide), and SiO2 (silicon dioxide). Reflectivity is fairly flat across the spectrum, optimizing it for both imaging and visual observing.
Multi-layer anti-reflective coatings made from precise layers of MgF2 (magnesium fluoride) and HfO2 (hafnium dioxide). Hafnium - a rare element that costs nearly $2,000 per kilogram - gives us a wider band pass than the titanium used in competing coatings.
High-transmission water white glass is used instead of soda lime glass for the corrector lens. Water white glass transmits about 90.5% without anti-reflective coatings; that’s 3.5% better transmission than uncoated soda lime glass. When water white glass is used in conjunction with StarBright XLT’s anti-reflective coatings, the average transmission reaches 97.4%, an 8% improvement.

Optical design:Maksutov-Cassegrain
Aperture:180 mm (7.08")
Focal length:2700 mm (106.3")
Focal ratio:f/15
Eyepiece focal length and barrel size:28 mm 2" eyepiece
Magnification with the supplied eyepiece:96x
Resolution (DAWES):0.52 arc seconds
Resolution (RAYLEIGH):0.64 arc seconds
Finder scope:8x50
Star diagonal:2" with 1.25" adapter
Highest useful magnification:420x
Lowest useful magnification:67x
Limiting magnitude:13.9 mag
Light collecting capacity (to the human eye):661x
Secondary mirror obstruction:40 mm (1.57")
Secondary mirror obstruction relative to the diameter:22%
Secondary mirror obstruction relative to the surface:5%
Coating:StarBright XLT
Tube length:57.15 cm (22.5")
Tube (material):Aluminum
Tube weight:8.6 kg (19 lbs)
Mount:Equatorial mount (motorized)
Motor drive:DC servo motors
Swivel speed:9 swivel speeds - maximum speed 4°/second
Tracking speeds:Sidereal, sun and moon
Tracking modes:EQ North & EQ South
Power consumption:12 V DC, 3.2 A
Number of AUX ports:2 Aux ports (1x hand controller port and 1x AUX port for optional accessories)
USB port:Yes, on mount and hand controller
Guiding Port:Autoguiding Port
Alignment methods:2-Star Align, 1-Star Align, Solar System Align, Last Alignment, Quick Align
Permanent periodic error control (PPEC):yes
Manual control box:2 lines x 18 characters backlit liquid crystal display, 19 LED backlit buttons, USB 2.0 port for PC connection
Database:40,000+ objects, 100 user-defined programmable objects. Extended information on over 200 objects
Software Features:Celestron´s Starry Night Special Edition Software, SkyPortal App
Carrying capacity (kg):18 kg (40 lbs)
Latitude (polar height) adjustment:15° - 70°.
Counterweights:1 x 7 kg (17 lbs)
Diameter tripod legs:50.8 mm (2") heavy duty steel tripod with markings for quick height adjustment
Height (mm):134.6 cm - 165.1 cm (53" - 65") - Mount and tripod
Mount head weight:18.14 kg (40 lbs)
Total weight:41 kg (90.5 lbs)
Optical tube assembly
Mount with handbox and tripod
2" Visual Back eyepiece receptacle
2" star diagonal mirror with adapter to 1.25"
28 mm eyepiece
8x50 finder scope

Customer report
Our customer Oliver Stegen has summarized his first experiences with the telescope optics as a short report:

"Perfect for observing the moon and planets. Clearly outperforms an 8 inch SC in contrast and details, for example in the moon and Jupiter. The special coating of the surfaces of the Celestron is noticeable in a significantly brighter image than the comparable Skywatcher Skymax- 180, which justifies the higher purchase price.The significantly larger dovetail bar than on the Skymax-180 is also positive, as it makes it easier to balance the weight.

For a better overview, for example to have the complete moon in the picture, you should use a good eyepiece larger than 50mm. I use the TeleVue Plössl 55mm for this.

The cool down time is not dramatically above a SC. With closed systems, longer cooling times must always be taken into account. On the other hand, the optics of the Mak are much less susceptible to adjustment. A dew shield is also important to prevent fogging of the optics.

Then you have a perfect instrument for visual observation and astrophotography, especially of the sun, moon and planets."

Many thanks to Oliver Stegen for this helpful report!


Recommended accessories




Accessories for mounts

Books

Cleaning & Collimating

Diagonal Mirrors & Prisms

TSA90

TS-Optics 1.25 inch Erecting / Amici Prism - 90°

TS-Optics 1.25 inch Erecting / Amici Prism - 90°

  • On stock
  • Only 1 pcs left in stock

EUR 49,90RRP EUR 59,00you save 15.4% (EUR 9,10)

%

Eyepiece-side accessories like Filters

TSND09

TS-Optics 1.25" Grey Filter ND 09 - 13% Transmission - Neutral Density

TS-Optics 1.25" Grey Filter ND 09 - 13% Transmission - Neutral Density

  • On stock
  • Only 1 pcs left in stock

EUR 22,87RRP EUR 24,90you save 8.2% (EUR 2,03)

%

Eyepieces

TSSP9

TS-Optics Super Plössl Eyepiece 9 mm 1.25"

TS-Optics Super Plössl Eyepiece 9 mm 1.25"

  • On stock
  • Only 1 pcs left in stock

EUR 39,00

TSWA38

TS-Optics 38 mm 2" - 70° Wide Angle Eyepiece

TS-Optics 38 mm 2" - 70° Wide Angle Eyepiece

  • On stock
  • Only 1 pcs left in stock

EUR 149,90RRP EUR 169,00you save 11.3% (EUR 19,10)

%

General Accessories

Photo Acessories

TSFA2

TS-Optics Focal Adapter from 2 Inch to T2 (M42x0,75)

TS-Optics Focal Adapter from 2 Inch to T2 (M42x0,75)

  • On stock
  • Only 1 pcs left in stock

EUR 29,90RRP EUR 34,90you save 14.3% (EUR 5,00)

%

TSSSI

TS-Optics moon and planetary astro CCD camera with 1,25" connection

TS-Optics moon and planetary astro CCD camera with 1,25" connection

  • On stock
  • Only 1 pcs left in stock

EUR 49,98RRP EUR 89,00you save 43.8% (EUR 39,02)

%

TSTCD300

TS-Optics 3 MP Digital Camera for Telescopes

TS-Optics 3 MP Digital Camera for Telescopes

  • On stock
  • Only 1 pcs left in stock

EUR 179,00RRP EUR 269,00you save 33.5% (EUR 90,00)

%

Power Supply

Reviews