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Celestron CGEM DX 1100 HD Computerized Telescope

B&H # CECGEMDX1100 MFR # 11002
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Product Highlights

  • 11.0" / 279.4mm Schmidt-Cassegrain
  • Focal Length: 2800mm, f/10
  • EdgeHD Optical System
  • Starbright XLT Coatings
  • CGEM DX Computerized Equatorial Mount
  • 23mm Eyepiece
  • 2" Diagonal
  • 9x50 Finderscope
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Price: $4,399.00

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The CGEM DX 1100 HD Computerized Telescope from Celestron features an EdgeHD Schmidt-Cassegrain optical system. This compound, or catadioptric, light-path employs a combination of mirrors and lenses that offer a large high-resolution aperture, a shorter tube length, and enhanced portability. This telescope has a 11" aperture, a focal length of 2800mm, and a focal ratio of f/10. The EdgeHD optics delivers pinpoint, aberration-free images even with the widest field eyepiece. They are designed to produce an extremely flat focal plane precise enough to match the strict tolerances of large commercial CCD detectors, allowing all stars to be in tight focus to the very edge of the chip. Mirror tension locks hold the primary mirror in place and reduce image shift. There are cooling vents to allow hot air to be released from behind the primary mirror. It is Fastar compatible for fast f/2 imaging.

The optical path consists of a zero power corrector plate, a spherical primary mirror, and a secondary mirror along with a set of field flattening lenses integrated into the baffle tube. The resulting imaging plane is 3 times flatter than the field produced by a standard SCT telescope.

The StarBright XLT coatings are designed to produce fairly flat reflectivity across the spectrum, optimized for both CCD imaging and visual use. This high performance optical system utilizes multi-layer, anti-reflective coatings and high transmission Water White glass for the corrector lens. This results in a peak light transmission for the system of 89% at 520 nm.

The OTA comes with a very useful 9x50 finderscope fitted to its exterior. Due to its wider field of view, this ancillary optic can offer assistance in locating objects to view with the main scope.

Normal image orientation for the EdgeHD design is upside-down and reversed. The 2.0" diagonal inverts this image so it is right-side-up, but reversed. This diagonal directly accepts 2.0" eyepieces, and a 1.25" eyepiece adapter is included. It is packaged with a 23mm eyepiece.

The CGEM DX Mount is fully computerized with a database of over 40,000+ celestial objects, and it offers numerous design advantages. The CGEM DX is a sturdy and reliable mount with an excellent feature set that fills the niche between the advanced and pro series mounts. The software-assisted all-star polar alignment feature allows the viewer to choose any bright star for alignment of the mount's polar axis, even if the North Star isn't visible. Large hand-knobs offer easy altitude and azimuth adjustments. With just a standard hand-control alignment, the CGEM DX is capable of centering a star to within 5 arc minutes. The NexStar program's advanced pointing feature further improves the pointing accuracy to as low as 1 arc minute. Additionally, extended meridian tracking, nine available slew speeds from .5 to 5° per second, and a precision tracking system all combine to provide outstanding tracking and viewing performance

The CGE PRO style, 2.75" tripod legs holds the OTA securely while dampening vibration and steadying both imaging and visual observing.

The All-Star polar alignment procedure allows a user to choose any bright star, after the telescope has been aligned with 2 bright stars, and the software then calculates and assists with the telescope's alignment for more precise accuracy. NexRemote allows control of the computerized telescope from a personal computer. Everything that is usually done with the telescope's hand control can be done remotely from a PC or laptop. Software can be kept current with downloadable upgrades via the internet.

Optical Performance
  • Aperture: 11"
  • Focal Length: 2800 mm / Focal Ratio: f/10
  • High quality SCHOTT glass
  • EdgeHD Schmidt-Cassegrain system for aberration-free imaging
  • Premium StarBright XLT coatings for enhanced light transmission
  • 23 mm eyepiece
Construction Details
  • Aluminum tube
  • Mirror support knobs reduce image shift
  • Filtered tube vents release hot air from behind the primary mirror
  • Designated six-pin RJ-12 modular jack, ST-4 compatible guide port
  • RS-232 port and cable for laptop/personal computer telescope control
  • Autoguide port and Auxiliary ports located on the electronic plate for long exposure astrophotography
  • Liquid Crystal Display Hand Control for operation of GoTo features
9x50 finderscope
  • Assists in locating objects
  • All mounting hardware is included in kit
90° Diagonal
  • Accepts 2.0" eyepieces. A 1.25" eyepiece adapter is included
  • Image orientation: right-side-up, laterally reversed
CGEM Computerized Equatorial Mount
  • One 22 lb counterweight
  • Stainless steel tripod: 2.75" legs, accessory tray
  • NexStar technology: 40,000+ object database, expanded information on 200+ objects, 100+ user-definable objects. Custom database lists famous deep-sky objects by name and catalog number
  • All-Star" polar alignment uses any bright star for a quick and accurate Polar alignment, even if the North Star is not visible
  • Software features: mount calibration, database filter limits, hibernate, five alignment procedures
  • Flash upgradeable hand control software and motor control units for downloading product updates over the Internet
  • Programmable periodic error correction (PEC) corrects tracking errors
  • Low cog DC servo motors with integrated optical encoders offer smooth and quiet operation and long-term reliability. The motor armatures are skewed to minimize cogging which is required for low speed tracking
  • 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, LED backlit 16-character LCD hand control simplifies 'Go-To' operation. NexRemote software for computerized telescope control via RS-232 port. Flash upgradeable hand control, software, and motor control units. Product updates available over the Internet. Internal cable wiring for trouble-free setup and transportation.
  • Precision machined 40 mm diameter steel Polar shafts supported by multiple tapered roller bearings and ball bearings
Optical Design Schmidt-Cassegrain
Aperture 11.0" / 279.4 mm
Focal Length 110.2" / 2800 mm
Focal Ratio f/10
Resolving Power Rayleigh: 0.5 arc/sec
Dawes: 0.41 arc/sec
Theoretical Minimum and Maximum Magnification Min: 40x
Max: 661x
Dovetail Plate Included
Visual Back Included
Eyepiece Barrel Diameter 2" diagonal with 1.25" adapter
Finderscope 9x50
Power Source 12 VDC 3.5 Amps
Car Battery Adapter Included
Secondary Mirror Obstruction 3.75" / 95.25 mm
By Area: 11.6%
By Diameter: 34%
Optical Tube Dimensions 24.0" / 609.6 mm
Weight OTA: 28 lb / 12.7 kg
With tripod/mount: 120 lb / 54.43 kg
Celestron CGEM DX 1100 HD Computerized Telescope
  • 23 mm Eyepiece
  • 9x50 Finderscope
  • 90-Degree Mirror Diagonal (2") for SCT Scopes
  • CGEM DX Computerized Equatorial Mount
  • Adjustable Stainless Steel Tripod w/ Accessory Tray
  • Car Battery Adapter
  • 22 lb Counterweight
  • NexRemote Telescope Control Software
  • RS232 Cable
  • Limited 2 Year Warranty
  • REVIEW SNAPSHOT®

    by PowerReviews
    CelestronCGEM DX 1100 HD Computerized Telescope
     
    5.0

    (based on 2 reviews)

    Ratings Distribution

    • 5 Stars

       

      (2)

    • 4 Stars

       

      (0)

    • 3 Stars

       

      (0)

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    Reviewed by 2 customers

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    (1 of 1 customers found this review helpful)

     
    5.0

    Great Scope but interface needs updating

    By Backyard Roy

    from Valley Center, Ca

    About Me Casual/ Recreational

    Verified Reviewer

    Pros

    • Good Solid Mount
    • Great optics

    Cons

    • Hard To Get A Good Align

    Best Uses

    • Astronomy

    Comments about Celestron CGEM DX 1100 HD Computerized Telescope:

    The mount and tripod are very stable especially with the two 17 lb counter weights. It breaks down to four major pieces for storage and setup: optics tube (OTA), CGEM mount, weights, and tripod. Takes some muscle to set it up. But it's worth it because of the stability and the large 11 in aperature size which collects more light. Glad I bought the 11 inch Edge-HD. It really is clear to the edge. But even on a clear night with the full moon can't see much other than planets and star doublets, and Mars is just a smeared dot. The moon is crystal clear all the way to 400 power. At 700 power optical problems show up, but the moons features are really big. Looking forward to a good moonless night. I'm sure planetary details, color, galaxies and other objects will show up. (If not it's going back to the dealer, this baby cost me 4 grand).
    The scope is supposed to be delivered with the 23mm Axiom lense, but I got the Celestron 23 instead, same specs but apparently a step down in optical quality (according to Celestron's own web site. They said Axiom has been discontinued long ago, but it's still plastered all over everything. When the eyepiece is mounted on the OTA the tube is back heavy. Needs a weight on the front to balance it (which isn't provided of course). The power cord delivered is for plugging into a car. Need to buy the AC power adapter to use it in the backyard. Seems backwards, another 50 bucks. There is no GPS, that's extra too. Every time you start the scope you need to enter the time, it always comes up with the last time you entered, which is pretty stupid, I would rather see zeros that some bogus time (maybe a battery on the clock would help, like PC clocks). Seems like a no brainer to have GPS on a scope like this, but it isn't, thats extra too. The star align feature works if you can identify the star you're looking for in the spotting scope. Permanent mount would work better. I find myself cycling power a lot to start over, because of alignment mistakes and procedures. The controller logic is a bit screwball, it keeps giving me the same few stars to align to, which always seems to be all south and west in the brightest part of the sky after sunset. The east ones pop out in the sky first, but none of those are in the list (unless you use the multitude list which have names gotten from who knows where). Solar system align sort of works but the alignment is never very good for some reason, and you can't use more that two planets. Need to unsync one in order to use another. Best alignment is two star, followed by more calib stars and polar align, then repeat (meaning cycle power and start over with the newly aligned mount to polar). Getting a really good align on this thing is hard to do without the fancy star pattern recognition module (extra). Accessories appear endless for ease of use and astro photography. All told, this scopes optics and mount are great and I"ll probably keep it. I hope Celestron can come up with some firmware improvements in the meantime.

    • Was this a gift?:
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    5.0

    Great Scope

    By ToddEgg

    from Austin, TX

    Verified Buyer

    Pros

    • Easy to Use
    • Strong Construction

    Cons

    • Heavy

    Best Uses

    • Astronomy

    Comments about Celestron CGEM DX 1100 HD Computerized Telescope:

    Movable, extra set of hands helps, though. Great images.

    • Was this a gift?:
    • No

    Share this review

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