CELESTRON - CGEM DX 1100 Schmidt-Cassegrain 11" Computerized Telescope • 11000
The Celestron CGEM DX 1100 Schmidt-Cassegrain Computerized Telescope includes both the 11" OTA and the CGEM DX Equatorial Mount. The optical tube assembly is a classic Schmidt design, meaning it uses aspects and features from both refractors and reflectors. The use of a correcting lens and a primary mirror system make these types of scopes have a focal ratio of around f/10 but can be reduced to f/6.3 with an optional reducer. It is also coated with the StarBright XLT coatings from Celestron which improve light reflectivity.
Equatorial mounts are almost always preferred by professional astrophotographers, mainly because of their adjustable altitude and azimuth features as well as payload capacity. The Celestron DX Equatorial Mount is suitable for astrophotography, holding optical tubes of up to 40 pounds! The All-Star Polar Alignment makes it easy for the user to precisely align the mount to the north celestial pole for accurate slewing and tracking of stars. This comes especially handy for astrophotography. In order to precisely align the mount, the user must follow the standard two star alignment and then select a star on the hand controller to slew to. Once polar align is selected, the telescope with point to the coordinates assuming the mount was already polar aligned. Once the user centers the star by adjusting the azimuth and altitude, the mount is aligned to the north celestial pole. The tracking in this mount is another great astro-imagining feature because the CGEM DX tracks past the meridian to render the clearest images possible.
- 11" Classic Schmidt-Cassegrain Design
- CGEM DX Computerized Equatorial Mount
- Schmidt-Cassegrain mechanism that moves the primary mirror to adjust focus is supported by two pre-loaded ball bearings, minimizing the "mirror flop" typical of bushing focus mechanisms
- Celestron's premium StarBright XLT coatings
- 9x50 finderscope to help accurately find objects
- Ultra sturdy 2.75 inch steel tripod with Accessory Tray
- Star diagonal provides more comfortable viewing position when observing objects that are high in the sky
|Name||Celestron - CGEM DX 1100 Schmidt-Cassegrain 11" Computerized Telescope|
|Custom Stock Status||In Stock|
|Telescope Aperture||10.1" - 12"|
|Alignment Procedures||2-Star Align, Quick Align, 1-Star Align, Last Alignment, Solar System Align|
|Angular Field of View||0.71 °|
|Aperture||280 mm (11.02 in)|
|Computer Hand Control||Double line, 16 character Liquid Crystal Display; 19 fiber optic backlit LED buttons|
|Counterweights||1 x 22 lbs|
|Database||40,000+ objects, 100 user defined programmable objects. Enhanced information on over 200 objects|
|Eyepiece 1||40 mm (1.57 in)|
|Eyepiece 1 Field of View||.71 °|
|Focal Length||2800 mm (110.24 in)|
|GPS||Optional SkySync GPS Accessory|
|Mount||New CGEM DX Computerized Equatorial|
|Optical Tube Length||24 in (609.6 mm)|
|Power Supply||Car battery adapter|
|Resolution (Dawes)||0.41 arcsec|
|Resolution (Rayleigh)||0.5 arcsec|
|Secondary Mirror Obstruction||3.75 in (95.25 mm)|
|Secondary Mirror Obstruction by Area||11.6 %|
|Secondary Mirror Obstruction by Diameter||34 %|
|Tracking Modes||EQ North and EQ South|
|Tracking Rates||Sidereal, Solar and Lunar|
|Tripod||Adjustable, Stainless Steel|
At its lowest height, the finderscope is six and a half feet up. At its highest extension, I don't know how you would reach an eyepiece.
Visually I'm still struggling with the Celestron choice of alignment stars. I think their alignment star names are made up. I've had mine for several months and half of the few times I've taken it out, I've given up at the alignment stage.
How are the optics? Just fine, and the mount is stable.
Nevertheless, I'm now considering donating it to a school, but think that might be cruel joke on them.
It doesn't have to be this way. Are you listening, Celestron? (Posted on 8/10/2015)