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Celestron CGEM 1100 Schmidt-Cassegrain Telescope

Item# CELE311
 
4.5

(6 Ratings)

Customer Q & A

Price:

$3,399.00

List Price: $5997.95
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  • 11" Schmidt-Cassegrain Telescope
  • CGEM Computerized Equatorial Mount
  • Celestron's premium StarBright XLT Coatings
  • Ultra Sturdy 2" steel tripod with Accessory Tray
  • Includes NexRemote telescope control software
Details & Dimensions
Guarantee & Returns

Description

Celestron's CGEM-1100 features our high-end 11" Schmidt Cassegrian OTA with XLT coatings mounted on our brand new CGEM™ mount.

 

The Celestron CGEM™ mount 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. 

 

Ergonomic Design - CGEM 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 series has a new innovative Polar alignment procedure called All-Star™ (patent pending). All-Star allows users to choose any bright star, while the software calculates and assists with polar alignment.  Another great feature of the CGEM, 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 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, 400 user defined programmable objects and enhanced information on over 200 objects.

 

Celestron's CGEM 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.

 

Features:

 

  • CGEM Computerized Equatorial Mount
  • Ultra sturdy 2" steel tripod with Accessory Tray
  • 9x50 Finderscope for easy centering of objects
  • 40,000 object database with 400 user-definable objects and expanded information on over 200 objects
  • Proven NexStar computer control technology
  • Flash upgradeable hand control software and motor control units for downloading product updates over the Internet
  • New "All-star" Polar alignment uses any bright star for a quick and accurate Polar alignment
  • Software Features include: Mount Calibration, Database Filter Limits, Hibernate, five Alignment Procedures, and user-defined slew limits
  • Custom database lists of all the most famous deep-sky objects by name and catalog number; the most beautiful double, triple and quadruple stars; variable star; solar systems; objects and asterisms
  • Permanent programmable periodic error correction (PEC) - corrects for periodic tracking errors inherent to all worm drives
  • 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; the most beautiful double, triple and quadruple stars; variable star; solar systems; objects and asterisms
  • Steel worm gear and 90mm pitch diameter brass worm wheel
  • 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 fro low speed tracking.
  • Internal Cable wiring for trouble-free setup and transportation
  • Designated six-pin RJ-12 modular jack, ST-4 compatible guide port
  • Double line, 16-character Liquid Crystal Display Hand Control with backlit LED buttons for easy operation of goto features
  • Autoguide port and auxiliary ports located on the electronic pier for long exposure astrophotography
  • RS-232 communication port on hand control 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 CN16 GPS Accessory

 

Specifications

 

  • MOUNT:  Computerized Equatorial
  • TRIPOD:  Adjustable, Stainless Steel
  • CD ROM:  NexRemote control software with RS232 cable 
  • POWER SUPPLY:  Car battery adapter
  • TRIPOD WEIGHT:  17 lb (7.71 kg)
  • MOUNT WEIGHT:  41 lb (18.6 kg)
  • COUNTERWEIGHTS:  2 x 17 lb
  • MOTOR DRIVE:  Low cog DC Servo motors with encoders, both axes 
  • COMPUTER HAND CONTROL:  Double line, 16 character Liquid Crystal Display; 19 fiber optic backlit LED buttons 
  • SLEW SPEEDS:  Nine slew speeds: 4 °/sec, 2 °/sec, .5 °/sec, 64x, 16x, 8x, 4x, 1x, .5x
  • 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
  • SOFTWARE PRECISION:  24bit, 0.08 calculation
  • DATABASE:  40,000+ objects, 400 user defined programmable objects. Enhanced information on over 200 objects
  • POWER REQUIREMENTS:  12 VDC 1.5 Amp
  • GPS:  Optional CN-16 GPS Accessory

 

 

About Celestron Schmidt-Cassegrain Telescopes

 

Celestron’s excellent Schmidt-Cassegrain telescopes are compact and portable and represent the best all-purpose design for a wide variety of uses from terrestrial and deep sky viewing to astrophotography.


Catadioptrics use a combination of mirrors and lenses to "fold" (reflect) the light path and form an image. In a Schmidt-Cassegrain, the light enters through a thin aspheric Schmidt correcting lens. It then strikes the spherical primary mirror. It is reflected back up the tube and intercepted by a small secondary mirror which reflects the light out an opening in the rear of the instrument where the image is formed at the eyepiece.


Catadioptrics are the most popular and most modern type of telescope optical design and are marketed throughout the world in 3.5" and larger apertures. Catadioptric telescopes combine the practical advantages of lenses and mirrors while eliminating their disadvantages. They offer the clarity and contrast of refractors with the low aberration of reflectors. Catadioptrics have an average focal ratio of f/10, which is wide enough for all types of photography. They are also easier to maintain because all optical elements are solidly mounted and rigidly collimated. Catadioptric telescopes provide the best possible combination of light gathering power, long focal length, portability and affordability.

 

Schmidt-Cassegrain Advantages

 

  • Very versatile, best all-purpose telescope design
  • Combines the optical advantages of both lenses and mirrors while eliminating their disadvantages
  • Excellent optics and razor sharp images over a wide field
  • Excellent for deep sky observing and astrophotography as well as terrestrial viewing
  • Very good for lunar, planetary and binary star observing
  • Focal ratio generally around f/10, it also has the best near focus capability of any type of telescope
  • Closed tube design reduces image-degrading air currents
  • Extremely compact and portable
  • Easy to use, durable and virtually maintenance free
  • Large apertures at reasonable cost and less expensive than equivalent aperture refractors
  • More accessories available than with other types of telescopes

 

Schmidt-Cassegrain Disadvantages

 

  • More expensive than Newtonians of equal aperture
  • Slight light loss due to secondary mirror obstruction compared to refractors The Maksutov-Cassegrain is similar to the Schmidt-Cassegrain with essentially the same advantages and disadvantages. It uses a thick meniscus correcting lens with a strong curvature and a secondary mirror that is usually an aluminized spot on the corrector.

 

 

Celestron All-Star Polar Alignment Technology


All-Star Polar Alignment Technology
German Equatorial Mounts (GEM) have long since been recognized as the mount of choice for astrophotography. Needing to track in only one axis for long exposures; adjustable counterweights and tube position for perfect balance, the GEM has few short comings when it comes to imaging. In order to do long-exposure astro-imaging, an equatorially aligned telescope is needed to allow your telescope to properly track the motion of the sky. However accurate tracking still depends on an accurate polar alignment. Even with a visible star very near the North Celestial Pole (NCP), the true celestial pole can be a very elusive place to find without assistance.

 

Now select Celestron mounts can utilize 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.

 

Here's how it works.

Once your telescope is aligned with two bright star, All-Star allows you to choose any bright star listed in the NexStar hand control to assist in accurately aligning your telescope's mount with the North Celestial Pole. Using the telescope's Sync function, the mount is able to point and center a bright star with a high degree of accuracy. Once centered, the mount will point the telescope to the exact position that the star should be if the mount were precisely polar aligned. By simply adjusting the mounts altitude and azimuth controls to re-center the star in the center of the eyepiece, you are actually moving the mounts polar axis to the exact position of the North Celestial Pole.

 

FAQ

 

Can I use Polaris to polar align my telescope?
Since Polaris is very close to the NCP and not very bright, it is actually not a recommended star for the "All-Star" method. The advantages of being able to use stars other than Polaris are two fold:

Polaris is not always visible. So not only can you use a variety of other stars but they are also brighter and more prominent.
The star you choose will be farther away from the NCP thus allowing for greater accuracy when centering the star in your eyepiece.

 

Which stars are best to use for polar aligning?
For best results choose a bright alignment star that is near the Meridian, preferably close to the celestial equator. Try to avoid stars that are close to the west/east horizon or directly overhead because they can be more difficult to center using the mount's altitude and azimuth controls. Also stars too near the celestial pole are less accurate than those further away.

 

Will I lose my alignment after I polar align?
No, the mount will retain its alignment but some amount of accuracy may be compromised depending on how much the mount has been moved during polar alignment. Although the telscopes tracking may be very good, pointing accuracy may need to be improved, especially if you are trying to located small objects on a ccd chip.

 

What are the steps to polar align my telescope using "All-Star" polar alignment?

 

  • Align the telescope with the sky using the "Two-Star Alignment" method.
  • Select a suitable bright star from the Hand Control's database and slew the telescope to the star.
  • Press the Align button and select Polar Align => Align Mount from the list.
  • The telescope will then re-slew to the alignment star and ask you to center it in the eyepiece in order to "Sync" on the star.
  • The telescope will slew to the position that the star should be if it were accurately polar aligned.
  • Use the mounts altitude and azimuth adjustments to place the star in the center of the eyepiece and press the Align button.
  • Update the telescope's star alignment if necessary.

Supplier Sku:
11099
Shipping Restrictions:
Available for shipment to the USA and Canada only.

Dimensions & Specifications

Weight

120 lbs.

Recommended Usage

Viewing Galaxies/Star Clusters

Warranty

2-Year Limited

Features

Equatorial Mount , GoTo

Configuration

StarBright XLT Optical Coating

Brand

Celestron

Finderscope

9x50

Telescopes Series

Celestron CGEM Telescopes

Optical Design

Schmidt-Cassegrain

Aperture

280mm

Focal Length

2800mm

Focal Ratio

f/10

Mount Design

Equatorial

Eyepiece 1

40mm (70x)

Highest Useful Magnification

661x

Star Diagonal

1.25 diagonal prism

Object Database

40000 objects

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The Perfect Accessories

Customer Reviews

REVIEW SNAPSHOT®

by PowerReviews
Celestron CGEM 1100 Schmidt-Cassegrain Telescope
 
4.7

(based on 6 reviews)

Ratings Distribution

  • 5 Stars

     

    (4)

  • 4 Stars

     

    (2)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

100%

of respondents would recommend this to a friend.

Pros

  • Accurate (6)
  • Strong construction (6)
  • Quality lenses (4)

Cons

  • Heavy (3)

Best Uses

  • Astronomy (6)
    • Reviewer Profile:
    • Avid adventurer (4)
    • Was this a gift?:
    • No (3)

Reviewed by 6 customers

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(0 of 1 customers found this review helpful)

 
5.0

great scope

By javiersolis1976

from abington pa

About Me Casual/ Recreational

Pros

  • Accurate
  • Easy to Use
  • Strong Construction

Cons

  • Heavy

Best Uses

  • Astronomy

Comments about Celestron CGEM 1100 Schmidt-Cassegrain Telescope:

I've has a few scopes, and by far this is the best.

  • Was this a gift?:
  • No

(1 of 1 customers found this review helpful)

 
5.0

Couldn't Ask For Anything Better!

By Rick

from NW Indiana

About Me Avid Adventurer

Pros

  • Accurate
  • Quality Lenses
  • Strong Construction

Cons

  • None

Best Uses

  • Astronomy

Comments about Celestron CGEM 1100 Schmidt-Cassegrain Telescope:

This is a very nice scope. Even paying the [$] its worth it, but being on sale for [$] makes it a no brainer. As for setup you have to do it in pieces, but after a few times of doing it, it becomes quite simple. Once you get it polar lined up, the fun begins. I seen Saturn better then I have ever have, and slewed to many galaxies and they were right there to be viewed. My older xt10i I was unable to. Don't get me wrong, that is a very nice scope, but I wanted more and the Cgem 1100 gave it to me. I am looking forward to Jupiter coming back up as well as some of my favorite deep sky object, so I can re-explore them. This was well worth the money.

  • Was this a gift?:
  • No

(2 of 2 customers found this review helpful)

 
5.0

Love it!

By rruhip1

from Utah

About Me Casual/ Recreational

Verified Buyer

Pros

  • Accurate
  • Quality Lenses
  • Strong Construction

Cons

  • Heavy

Best Uses

  • Astronomy
  • Bright Conditions
  • Low Visibility

Comments about Celestron CGEM 1100 Schmidt-Cassegrain Telescope:

Can't imagine anyone not happy with this. In 30 min. I saw more than I have ever before in my life.

  • Was this a gift?:
  • No

(0 of 3 customers found this review helpful)

 
4.0

My first scope

By Tony

from Atlanta, GA

About Me Avid Adventurer

Verified Buyer

Pros

  • Accurate
  • Quality Lenses
  • Set up is easy
  • Strong Construction

Cons

    Best Uses

    • Astronomy

    Comments about Celestron CGEM 1100 Schmidt-Cassegrain Telescope:

    This is my first scope.[...] I have had it out a few times now and could not be happier with the quality and ease of operation. Even in my light polluted suburb there is plenty to see through this scope. If you are going to add any accessories to it you will need additional weights.

    (6 of 7 customers found this review helpful)

     
    4.0

    Much good and some not so good

    By GREGFIXIT

    from Minnesota

    About Me Avid Adventurer

    Verified Buyer

    Pros

    • Accurate
    • Strong Construction

    Cons

    • Ergonomics
    • Heavy

    Best Uses

    • Astronomy

    Comments about Celestron CGEM 1100 Schmidt-Cassegrain Telescope:

    This is the first big telescope for me. It is also the first equatorial mount. Out of the box there were a few small issues. One of the rivets that holds the cover in place was broken and the unit needed collimation. (Both were fairly easy fixes) The assembly, setup and alignment all went very smooth. I was viewing Saturn less than 20 minutes after I started to set up. On the first evening of use I had trouble with the power jack. By the second evening, I couldn't use it at all because of the bad jack. I ended up repairing this problem myself. (I fix electronics for a living so it wasn't difficult.) For many users, this would have required them to return the mount. (A painful process for something so heavy) I had two weeks of enjoyable viewing, trying out new locations and improving my alignment skills every time out. I finally had an opportunity to bring the scope to a very remote location with an incredible view of the night sky. For unknown reasons, it failed to work properly. The mount would begin moving on its own and would not go to the correct locations. To make matters worse, I crushed my thumb between the RA lock lever and the body of the equatorial mount. This probably wouldn't have happened, but I had to continually go back to the 'home' position since the mount had a mind of its own. The scope and mount were well balanced but since there is about 35lbs on each end of center, my thumb absorbed the energy from all that momentum. (I will lose my thumbnail as a result… OUCH) I didn't touch the scope until I got home 3 days later and when I set it up, everything worked!? This is very frustrating. When the scope is working it is great! The alignment is easy, the 'additional calibration stars' feature makes it goto and track very well. The views I get are incredible! I just don't know how often I will get an opportunity to view from remote locations and I wish I were more confident that the mount would work when I get there.

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