Celestron SKU: 12018 | Helix SKU: CT12018
EDGE HD FEATURES
COMPUTERIZED MOUNT FEATURES
CGEM II 925 HD combines Celestron's newly redesigned CGEM II computerized 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.
OPTICAL TUBE INFO:
SEE THE UNIVERSE IN HD
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.
TRUE ASTROGRAPH QUALITY
Many optical designs that advertise themselves as "astrographs" actually only produce pinpoint stars across a curved focal plane. While this may be acceptable for some visual observing, stars will appear out of focus at the edge when used with the flat chip sensor of a digital camera. EdgeHD optics produce a focal plane more than three-times flatter than a standard Schmidt-Cassegrain telescope and dramatically flatter than competing coma-free designs. This guarantees you visibly sharp stars across some of the largest CCD chips available today.
Superior edge performance not only creates rounder, more pleasing stars, but actually improves the resolution and limiting magnitude when compared to telescopes of equal aperture. With Celestron’s StarBright XLT optical coatings on every surface, EdgeHD optics gives you maximum light throughput across the widest visual and photographic spectrum.
In addition to EdgeHD’s optimized optical design, the telescope tube has been redesigned to make sure you get the most from your optics each and every night.
Every EdgeHD that ships has been tested not only for the surface quality of each optical component, but also with a camera and artificial star to ensure the imaging system meets our rigid quality assurance. This “final acceptance test” confirms the EdgeHD will perform in the field and deliver high-quality astroimages.
A fresh update to the venerable CGEM mount, the CGEM II has a fresh, attractive, bold appearance and is capable of carrying Celestron’s higher-end SCT optical tubes (up to 11") securely and vibration free, which is ideal for both imaging and visual observing. Capable of holding 40 lbs. of payload and slewing at 5° per second, you will be able to instantly point to any of the celestial objects in the database.
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.
The CGEM II series features Celestron’s innovative Polar alignment procedure called All-Star™. All-Star allows users to choose any bright star, while the software calculates and assists with polar alignment. 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.
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 Series and CGE Series. Offering the portability of the Advanced Series and the precision of the CGE.
|Optical Tube Info:|
|Aperture (mm)||234.95 mm (9.25 in)|
|Focal Length||2350 mm (93 in)|
|Focal Length of Eyepiece 1 (mm)||23 mm (0.91 in)|
|Magnification of Eyepiece 1||102 x|
|Star Diagonal||2" w/ 1.25" adapter|
|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 Type||German Equatorial Mount|
|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 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|
|Computerized 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||40 lbs|
|Tripod Weight||20 lbs|
|Weight of Counterweight||1 x 17 lbs, 1 x 11 lbs counterweights|
|Total Weight of Mount Kit||77 lbs|