About this product
Model: cel_cgem_ii_925_edgehd_12018
Part Number: 12018
New Celestron CGEM II 9.25" EdgeHD
CGEM II 925 HD combines Celestron's newly redesigned CGEM II computerised equatorial mount with its acclaimed EdgeHD optical system. With over 9 inches of aperture and our premium StarBright XLT coatings, the CGEM II 925 HD gives you over 1000 times the light gathering power than the unaided eye. Designed to give diffraction limited performance and offer more resolution than the 800 with less weight than the 1100, the CGEM II 925 HD is a premier astroimaging telescope.
EdgeHD is an aplanatic, flat field Schmidt-Cassegrain telescope that produces aberration-free images across a wide visual and photographic field of view. The optical system was designed to reduce more than just off-axis star coma; it also provides an astrograph-quality flat focal plane all the way to the edge of the field of view.
Ergonomic Design
CGEM II was designed to be ergonomically friendly with large Altitude and Azimuth adjustment knobs for quick and easy polar alignment adjustment. The internal RA and DEC motor wiring provides a clean look and an easy and trouble free set up.
Innovation
The CGEM II series features Celestron’s innovative All-Star Polar alignment procedure. All-Star allows you to accurately polar align the mount using any star, even if the celestial pole cannot be seen. Another great feature of the CGEM II sure to please astroimagers, is the Permanent Periodic Error Correction (PEC) which will allow users to train out the worm gears periodic errors, while the mount retains the PEC recordings.
Performance
For objects near the Meridian (imaginary line passing from North to South), the CGEM II will track well past the Meridian for uninterrupted imaging through the most ideal part of the sky. The CGEM II mount has a robust database with over 40,000 objects, 100 user defined programmable objects and enhanced information on over 200 objects. Celestron's CGEM II mount is the perfect fit between the Advanced VX Series and CGX Series.
FEATURES
- 9.25” EdgeHD optics
- CGEM II computerized equatorial mount
- Celestron’s premium StarBright XLT coatings provide maximum light transmission
- A 9x50 finderscope, 2” mirror diagonal for more comfortable viewing, and wide-angle 23 mm Luminos 2" eyepiece are all included
- EdgeHD aplanatic, flat field SCT optics for pinpoint stars to the edge of the largest imaging sensors and widest eyepieces. Lightweight and portable
- Aluminum optical tube with tube vents featuring an integrated 95-micron mesh filter allows hot air to be released from behind the primary mirror. Mirror support knobs hold the mirror in place and reduce image shift during imaging
- Versatile design accommodates 3 focal ratios: native f/10, f/7 with the addition of a focal reducer, or ultra-fast f/2 imaging with a removable secondary mirror and third-party accessories
CGEM II MOUNT FEATURES
- 40 lbs payload capacity
- Dual-fit Vixen/CG-5 and Losmandy/CGE dovetail saddle
- 2" steel legs with height index marks for quick levelling
- USB 2.0 port on hand control for direct links to a PC via ASCOM supported software
- 40,000 object database with over 100 user-definable objects and expanded information on over 200 objects
- Internal cabling throughout for worry-free remote operation
- Low cog DC Servo motor with integrated optical encoders offer smooth, quiet operation
- Able to track past the meridian allowing seamless imaging
- Permanent periodic error corrections allow users to train out the worm gears periodic errors once, while the mount retains the PEC recordings
- Software Features include: Mount Calibration, Database Filter Limits, Hibernate, five Alignment Procedures, and user-defined slew limits
- Built-in polar alignment program to polar align on any star in the sky
- Longer clutch levers to make tightening and loosening of clutches easier
- Custom database lists of all the most famous deep-sky objects by name and catalog number
- Solar System alignment method allows to view the moon and planets during the day
- Permanent Programmable Periodic Error Correction (PEC) corrects periodic tracking errors inherent to all worm drives
- Custom Rate 9 feature allows to set maximum slew rate
- Tandem mode allows to star align the mount even when positioned for tandem scope use
- RS-232 communication port on hand control to control the telescope via a personal computer
- Includes NexRemote telescope control software, for advanced control of telescope via computer
- Precision machined 40 mm diameter steel Polar shafts supported by multiple tapered roller bearings and ball bearings
- GPS-compatible with optional SkySync GPS Accessory
What's in the box
- Telescope OTA
- 9x50 Finderscope
- 2" Star Diagonal
- 23mm Luminos 2" Eyepiece
- CGEM II Equatorial Head
- CGEM II Tripod
- Accessory Tray
- Counterweight bar with locking nut
- Counterweight
- Azimuth adjustment screws (x2)
- Hand Control
- Hand control holder (2 pieces)
- DC Power Cable (Cigar Plug)
Specifications
| Optical Design | EdgeHD |
| Aperture (mm) | 234.95 mm (9.25 in) |
| Focal Length | 2350 mm (93 in) |
| Focal Ratio | 10 |
| Focal Length of Eyepiece 1 (mm) | 23 mm (0.91 in) |
| Magnification of Eyepiece 1 | 102 x |
| Finderscpoe | 9x50 |
| Star Diagonal | 2" w/ 1.25" adapter |
| Optical Tube | Aluminum |
| Highest Useful Magnification | 555 x |
| Lowest Useful Magnification | 34 x |
| Limiting Stellar Magnitude | 14.4 |
| Resolution (Rayleigh) | 0.59 arc seconds |
| Resolution (Dawes) | 0.49 arc seconds |
| Light Gathering Power (Compared to human eye) | 1127 x |
| Secondary Mirror Obstruction | 3.35 in (85 mm) |
| Secondary Mirror Obstruction by Diameter | 36% |
| Secondary Mirror Obstruction by Area | 13% |
| Optical Coatings | StarBright XLT |
| Optical Tube Length | 22 in (559 mm) |
| Optical Tube Weight | 21 lbs. (9.53 kg) |
| Dovetail Compatibility | CGE Mount |
| Mount | German Equatorial |
| Tripod | 2” Steel tripod with graduated markings on lower section |
| Dovetail Mount | Directly connects to both CG-5 & CGE dovetail bars |
| Payload Capacity | 40 lbs |
| Latitude adjustment range | 15º – 70º |
| Power Requirements | 12 VDC, 3.2 amps |
| Ports | 1x Hand control port, 1x Auxiliary Port, 1x Auto guider port, 1 USB 2.0 port (on hand control) |
| Motor Drive | Low cog DC servo motors |
| Slew Speeds | 9 slew speeds |
| Tracking Rates | Sidereal, Solar and Lunar |
| Tracking Modes | EQ North and EQ South |
| Alignment Procedures | AutoAlign, 2-Star Align, Quick Align, 1-Star Align, Last Alignment, Solar System Align |
| Computerised Hand Control | Double line, 16 character Liquid Crystal Display; 19 fiber optic backlit LED buttons, USB 2.0 port for PC connection |
| Database | 40,000+ objects, 100 user defined programmable objects. Enhanced information on over 200 objects |
| Mount Weight | 40lbs |
| Tripod Weight | 20lbs |
| Weight of Counterweight | 17lbs |
| Total Weight | 77lbs |
Downloads / Manuals
The following manuals and downloads are available for this product:
Manuals
Celestron CGEM II Mount Manual (PDF)
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