Celestron CGEM DX 1100 HD 11" EdgeHD Schmidt-Cassegrain Telescope, 2800mm Focal Length

Celestron
Celestron CGEM DX 1100: Picture 1 thumbnail Celestron CGEM DX 1100: Picture 2 thumbnail Celestron CGEM DX 1100: Picture 3 thumbnail Celestron CGEM DX 1100: Picture 4 thumbnail Celestron CGEM DX 1100: Picture 5 thumbnail Celestron CGEM DX 1100: Picture 6 thumbnail

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About Celestron CGEM DX 1100

The CGEMDX 1100 HD combines Celestron's newly designedCGEMDX Computerized Equatorial Mount with its new EdgeHD optical system. With an optical tube assembly weighing only 28 lbs, this telescope is still portable enough to be taken to dark skies and has 89% more light gathering power than an 8" telescope and 40% more than the 9.25".
CGEM DX Mount
The CGEM DX mount is the newest member of our fully computerized Equatorial mount series capable of carrying Celestrons high-end 11" and 14" optical tubes. The CGE PRO style, 2.75" leg tripod holds even our 14" optics securely and vibration free, which is ideal for both imaging and visual observing. Capable of holding 50 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.
German Equatorial Mounts are recognized for their rock solid stability, simple balancing and easy accessibility for attaching accessories. With sophisticated software features like the Hibernate function, the CGEM DX can maintain its star alignment night after night without needing to be re-aligned, making it an excellent choice for a permanent observatory facility.
Ergonomic Design - CGEM DX 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 DX series has a new 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 DX 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 DX will track well past the Meridian for uninterrupted imaging through the most ideal part of the sky. The CGEM mount has a robust database with over 40,000 objects, 100 user defined programmable objects and enhanced information on over 200 objects.
Power Management - Redesigned electronics deliver constant regulated power to the motors making them capable of driving the telescope even when not perfectly balanced. This allows the CGEM DX to have the payload capacity of that of much larger mounts without sacrificing smooth tracking motion and pointing accuracy across the entire sky.
New Optical Design
The EdgeHD optical system takes all of the compact power popularized by the Schmidt Cassegrain Telescope (SCT) and combines it with an improved high definition optical system for wide field, astrograph quality images. As a visual instrument, EdgeHD optics deliver pinpoint images even with your widest field eyepiece. You can search for all of the Messier Catalog objects and see hundreds of other equally interesting NGC, IC and Caldwell objects with amazing clarity. For astroimaging, the EdgeHD optics produce aberration-free images across your favorite CCD or DSLR camera. All EdgeHD optics are designed to produce an extremely flat focal plane precise enough to match the strict tolerances of the largest commercial CCD detectors, allowing all stars to be in tight focus to the very edge of the chip..
Diffraction Limited
Some companies boast that their telescopes give diffraction limited stars in the very center of the field of view. EdgeHD optics not only produce diffraction limited stars on axis, but maintain diffraction limited stars across the entire field of view of many of the most popular astrophotography cameras.
Even at the

For two years, Celestron will cover repairs or replacement of this product in cases of defective components or damage from normal wear and tear.

Celestron CGEM DX 1100 Features

  • 11" EdgeHD Optics
  • New CGEM DX Computerized Equatorial Mount
  • Celestron's premium StarBright XLT coatings
  • 9x50 finderscope to help accurately find objects
  • Ultra sturdy 2.75" steel tripod with Accessory Tray
  • Star diagonal provides more comfortable viewing position when observing objects that are high in the sky
  • HD FeaturesNew aplanatic Schmidt telescope design produces aberration-free images across a wide field of view
  • Mirror tension locks hold the primary mirror in place and reduce image shift
  • Cooling vents allow hot air to be released from behind the primary mirror
  • Fastar compatible for fast f/2 imaging
  • Computerized Mount FeaturesProven NexStar computer control technology
  • 40,000 object database with over 100 user-definable objects and expanded information on over 200 objects
  • New "All-Star" Polar alignment uses any bright star for a quick and accurate Polar alignment
  • Software Features include
  • Flash upgradeable hand control software and motor control units for downloading product updates over the Internet
  • Custom database lists of all the most famous deep-sky objects by name and catalog number
  • Permanent Programmable Periodic Error Correction (PEC) - corrects for periodic tracking errors inherent to all worm drives
  • Drive Motors - Low Cog DC Servo motor with integrated optical encoders offer smooth, quiet operation and long life. The motor armatures are skewed to minimize cogging which is required for low speed tracking.
  • Internal Cable wiring for trouble-free setup and transportation
  • Designated six-pin RJ-12 modular jack, ST-4 compatible guide port
  • Autoguide port and Auxiliary ports located on the electronic plate for long exposure astrophotography
  • Double-line, 16-character Liquid Crystal Display Hand Control with backlit LED buttons for easy operation of goto features
  • RS-232 communication port on hand to control the telescope via a personal computer
  • Includes NexRemote telescope control software, for advanced control of your telescope via computer
  • GPS compatible with optional SkySync GPS Accessory
  • Precision machined 40 mm diameter steel Polar shafts supported by multiple tapered roller bearings and ball bearings.
  • Secure power plug ensures that the mount's power source is not accidentally disconnected

Celestron CGEM DX 1100 Specifications

Optical Design
EdgeHD
Aperture (mm)
280 mm (11 in)
Focal Length
2800 mm (110 in)
Focal Ratio
10
Focal Length of Eyepiece 1 (mm)
23 mm (0.91 in)
Magnification of Eyepiece 1
122 x
Finderscope
9x50
Star Diagonal
2"
Mount Type
New CGEM DX Computerized Equatorial
Tripod
Adjustable, Stainless Steel
Power Requirements
Car battery adapter
Highest Useful Magnification
661 x
Lowest Useful Magnification
40 x
Limiting Stellar Magnitude
14.7
Resolution (Rayleigh)
0.5 arc seconds
Resolution (Dawes)
0.41 arc seconds
Light Gathering Power (Compared to human
1600 x
Secondary Mirror Obstruction
3.75 in (95 mm)
Secondary Mirror Obstruction by Diameter
34%
Secondary Mirror Obstruction by Area
12%
Optical Tube Length
24 in (610 mm)
Total Telescope Kit Weight
145 lbs (66 kg)
Weight of Counterweights
1 x 22 lbs
Slew Speeds
Nine slew speeds
Tracking Rates
Sidereal, Solar and Lunar
Tracking Modes
EQ North and EQ South
Alignment Procedures
2-Star Align, Quick Align, 1-Star Align, Last Alignment, Solar System Align
Computer Hand Control
Double line, 16 character Liquid Crystal Display; 19 fiber optic backlit LED buttons
Database
40,000+ objects, 100 user defined programmable objects. Enhanced information on over 200 objects
GPS
Optional SkySync GPS Accessory
Warranty
2-year Telescope Warranty

Celestron CGEM DX 1100 Reviews

Reviewed by 2 customers

(3 of 3 customers found this review helpful)

 
5.0

Best Celestgron for photography

By

from Stamford, CT  -  Casual/ Recreational

After a couple years of practice, I got into guiding and the photography improved, and I also got a better planetary camera. I wanted to add to my other review (Deimos) but I don't have the login anymore. After this amount of time my only complaint is that the cord for the hand controller is very short and pulls on the scope when you use it. I think Celestron could have remedied this for $2. Also, the large aperture fogs up easily on the front plate so you will need anti -dew. Get a good car power supply from the auto zone to power the scope. The scope doesn't come with a battery so it can be disappointing when you first unbox if you don't have a battery. Anyway, here are some better photos taken with this scope, including a comet and the transit of venus.

(8 of 8 customers found this review helpful)

 
5.0

Very happy with this scope

By

from Stamford, CT  -  Casual/ Recreational

When I first bought this scope I thought that maybe I had gone too far since it's so large and on the pricey side. The photo doesn't give a good indication as to how big this thing is, needs an average guy to stand next to it. It stands almost a foot taller than myself. Now that I've had it a while I have no buyer's remorse at all; this thing will allow me to grow in the hobby for 10 or 15 years to come. This scope is ideal for anyone interested in astrophotography because of the heavy German Equatorial mount, the balancing, low vibration and the precise optics. This type of mount takes a bit longer to set up than an alt-azimuth, but with practice and some hustle I can get all the pieces together and roughly polar aligned in about 8 minutes. More precise alignment for longer exposures can take another 5 to 15 minutes depending on how long your exposures are. I can usually do a 2 or 3 minute unguided exposure ok with 10 minutes of effort on polar alignment. For more precise alignment the software comes with an "All - Star" system that makes things alot quicker, and is good enough for most purposes. I would recommend using this rather than buying the polar alignment scope, which I got but is too difficult to setup properly and is quite inaccurate. For setup, it helps if you organize most things in a big wooden box or something so you're not running back to the car to get every little piece. Save the molded packing foam for your storage. The scope's software / hand controller works fine. The more info you give it in the form of alignment and calibration stars, the more precise the go-to becomes. If you're having difficulty locating a particularly dim object, just add a calibration star that happens to be near the object in question, and the scope becomes more accurate in that area. I've seen many things that I never saw before because of this goto. Occasionally I will still hit the maps to help center something dim. When properly aligned, the scope will keep an object in view indefinately for visual purposes. For photography, I can do from 2-4 minutes without guiding before streaking becomes a big issue (will get guiding equipment later) Out of the box, the optics appear to my novice eye to be well collimated. Eventually I will buy some Bob's Knobs' for when I need to adjust calibration but so far is unecessary. Compared to my old standard SCT-8, the edge HD seems to deliver more pinpoint stars, as advertised. I've never had "seagulling" or lopsided stars in my photos except from polar alignment errors. Right away I was able to take photos using a Canon Rebel camera with an T-adpater. They're not fantastic photos but for an inexperienced person using a standard camera and no guiding I think they're pretty good. My planetary photos are not much better than they were with a C8, because weather is more a factor than aperture for that, but the mount keeps the planets better centered and vibration free so the images / videos were much, much easier to take. I can visually see more moons around Saturn than I could with the C8. The scope comes with a giant 2" eyepiece and 2" prism. I don't really use these myself because they add quite a bit of weight to a scope that already is heavy in the back from the mirror locks and thick mirror. I'm normally using a camera, anyway. It doesn't come with a 1.25" diagonal but there is an adapter for the 2" and for the visual back, so you can use your old smaller eyepieces. The finder scope is large. I had to do some work on it to get it capable of aligning with the cope, invoking the application of some duct tape. The only criticism I would have the the azimuth screws are not very accurate. You're supposed to be able to slowly screw them one way or the other with precision, but in practice I have to just loosen them up, strong arm the scope to where I want it, then tighten them and hope the az doesn't shift in the process. The included images are what I took within the first 4 outings with the scope. I had never taken a deep - sky photo before that. The deep skies are with unmodified Rebel Canon, the planets are with an Orion webcam.

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stephen o  How often does the scope have to be collimated?
stephen o  Thanks so much; just what I wanted to hear. stephen
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