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Celestron CGEM Computerized Equatorial Mount

Item # CE-91526
2 Questions(s)

Availability: In stock



Quick Overview

  • The Celestron CGEM Equatorial Mount is high performance equipment - capable of supporting 40 lbs. of payload with outstanding tracking accuracy.
  • Recommended for the avid visual astronomer or the discriminating deep sky astrophotographer.
  • The Celestron CGEM Equatorial Mount comes with Permanent PEC, Meridian Tracking, All Star Polar Alignment, a database of over 40,000 objects with 400 user-defined objects, GPS compatibility, a CGE-style mounting platform, and more!

Celestron CGEM Computerized Equatorial Mount

 CGEM Computerized Mount - 360 Degree View

User submitted images from OPTAS.net

Celestron CGEM Equatorial "GoTo" 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 - The Celestrom CGEM mount 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 Celestron 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 91526, 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 Celestron CGEM mount will track well past the Meridian for uninterrupted imaging through the most ideal part of the sky. The CGEM 91526 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 91526 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 of the Celestron CGEM 91526 Equatorial Mount...

  • 40,000 object database with 400 user-definable objects and expanded information on over 200 objects
  • Proven NexStar computer control technology
  • 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
  • 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
  • Permanent programmable periodic error correction (PEC) - corrects for periodic tracking errors inherent to all worm drives
  • 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 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 pier 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 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
Celestron Product Number: 91526
SKU CE-91526
Head Design Equatorial
Tripod or Pier Included? Yes
GPS Included? No
Electronics Included Computerized - GoTo
Manufacturer Celestron
Warranty 2 Year Warranty
Hand Controller Included Celestron CG Computerized
# of Counterweights Included 1
Weight of Counterweights 17 lb.
Tracking Rates Lunar, Sidereal, Solar
Objects in Database 40,000 +
Mount Special Features Spring Loaded Head Knobs
Saddle Width D Series
Weight Capacity 40 lbs.
Leg Length Not supplied by manufacturer
Accessory Tray Included? Yes
Material Steel
Power Supply Included DC Battery Adapter
Tracking Modes EQ North, EQ South
Latitude Range 15º - 70º
Weight of Tripod/Monopod 17 lbs.
Weight of Head 41 lbs.
  • Celestron CGEM Mount
  • Adjustable, Stainless Steel Tripod
  • Accessory Tray
  • Car Battery Adapter
  • Counterbalance
  • NexRemote Controller
  • Cables
  • Software
  • RS-232 Communication Port
  • NexStar Computer Control
  • Permanent Programmable Periodic Error Correction (PPEC)
  • Servo Motors
  • Encoders

Product Questions

Can you fit a polar alignment scope with it ?
What is the minimum and maximum height the tripod (excluding the mount) can be set to?

What are the corresponding numbers for the CGEM DX tripod?

Customer Reviews

Flat out awesome! Review by Ralph
1= Houston, We Have a Problem & 5= It's Out of This World
What a great investment! While I haven't had a lot of scope time due to fires in our state, I did get to lock on to M57 and track it for 2 hours without any noticeable drift. Any questions I had were answered by the knowledgeable staff at OPT and no significant issues have arose. This thing twirls my 10" reflector around like I can twirl a pencil! Great job to Teresa at sales, too. I couldn't have done it without her help. Thank you, OPT as well as Celestron for an excellent product, sales and shipping! (Posted on 9/2/15)
An Excellent Beginner Mount Review by East of Jupiter
1= Houston, We Have a Problem & 5= It's Out of This World
I have, and will continue to recommend the Celestron CGEM as a starter mount for people who can afford something bigger than the Celestron Advanced VX but cannot afford Losmandy or better quality mounts. The price isn’t prohibitively expensive like some of the other ‘luxury’ line mounts (Paramount, Astrophysics, etc) – and the functionality and ease of use are absolutely designed for a novice. The thoughtfulness of that alone is what will likely keep someone interested in astronomy. Frustration with equipment kills peoples enjoyment of this hobby and that is always a concern with the CGEM because I feel that the build quality is quite lacking, and there are some bad engineering choices. This mount does have it’s issues, but they can be overcome if you know how to identify the issue you have, making this a capable mount after you’ve done your homework. Not to mention a healthy dose of some elbow grease from time to time. As for astrophotography, well, this mount works great with light loads, like a DSLR (pictured left) or a small refractor, and can carry large 11 inch SCT’s for planetary photography.

My detailed review of the Celestron CGEM Mount is found at http://eastofjupiter.com/review-celestron-cgem-mount/ (Posted on 4/22/15)
Celestron CGEM Telescope Mount Review by Catmandu
My purchase arrived on time and with both of the two packages in good condition. Since I would be mounting this on a pier, I did not immediately assemble the tripod, but it is obviously a very sturdy, high quality tripod. I will be using the tripod with my old CG5-GT mount and 127 mm SCT for quick "grab and go" visual use.

Assembly of the mount went smoothly, and after some initial problems I found the CGEM mount is easier to align and a good deal more pleasant to use than the CG5-GT mount it replaces.

Much to my dismay, when I initially powered up the mount after finishing installation, the power LED was blinking and nothing appeared on the hand control display. I immediately unplugged it and checked the power supply, a heavy duty Celestron Power Tank. Not knowing if a blinking LED was indication of a fault or if it was possibly a normal condition while the mount was booting up the system, I plugged it back in and waited a moment. To my horror, a few seconds later I noticed the unmistakable strong smell of burning electronics. I am a retired electrical engineer, skilled in failure analysis, and over the years have become intimately familiar with that odor. In a panic, I pulled the plug once again.

After rechecking and verifying there was nothing wrong with the installation or the power supply I once again cautiously applied power, this time via a car cigarette lighter socket. Thankfully, the LED came on, remained steadily lit, unblinking. The hand control booted up and immediately displayed its normal opening lines, ready for data input and alignment of the mount. After going through the alignment procedures, everything seemed to work perfectly, and the motors slewed the scope smoothly and noticeably more quietly to the target than those of the CG5 it replaces. Going back to the Celestron Power Tank, all continued to work normally.

I breathed a sigh of relief, but still wonder what burnt on initial power up. Was it perhaps some grease from the gearbox that got on the control electronics, caused a short, then burned off? Whatever the case, since all seems to be working as intended, I hesitate to box it up and return it for warranty service.

The only other problem I noted was a distinct jump of the telescope when slewing in declination axis. Further investigation found the jump was caused by loose mounting screws in the telescope saddle. Tightening of all three with the appropriate allen wrench eliminated that problem. The drive now slews smoothly, quietly and accurately with no jumps to each new target.

Tracking with this mount right out of the box seems significantly better than that of the CG5 mount, and should further improve as I refine the polar alignment and make use of the PEC feature. It handles the load of my C 9.25 SCT, 80 mm piggyback guide scope and Nightscape CCD camera effortlessly, which was pushing the limits of the CG5 mount. Also, it has interface electronics that allow the mount to be controlled via PC. This is a really cool option, and it works great! I am able to control it remotely from INDOORS via Wi-Fi. This feature will give me much more use of my setup on those cold nights that kept me from using the telescope last winter.

Overall, I am very pleased with my purchase, though the initial power-up issues still have me a bit concerned, and I will be waiting for "the other shoe to drop" for a while. It is the one thing that keeps me from giving it five stars overall. Having said that, after approximately five or six hours of use, there have been no further problems, and everything works as advertised. (Posted on 5/2/14)
CGEM and astrophotography Review by Robert Fitzgerald
1= Houston, We Have a Problem & 5= It's Out of This World
Great mount and an improvement over then venerable Atlas EQG! No Polar Scope comes with mount and isn't needed anyway. Built-in polar alignment software works efficiently and accurately. Adjustment knobs are dream to use however the knobs on the saddle plate are a bit too smooth and make glove removal necessary to ensure safe torque.
W/O any adjustments or PEC corrections ii am able to image at native F/10 on both my C8HD and C11. The Nexstar remote software works great too. Works nicely with Maxim DL 4-5.12, CCD Autopilot and all other astro equipment. My only complaint is the mount will not Auto Meridian Flip during imaging however, it travels about two hours beyond Merdian! A top buy IMHO! (Posted on 11/9/10)
A great value for astrophotography! Review by Chris
1= Houston, We Have a Problem & 5= It's Out of This World
I took the new Celestron CGEM mount out for a test run in Dec. 2008, and I have to say that I was very impressed with its performance. I used a 4 Apo refractor at f/6 with a Canon DSLR and an inexpensive autoguiding setup, and the mount guided to a very respectable +/- 0.5 pixel RMS (around +/- 1.5 arcsec, giving me fairly round stars in 10 minute exposures. The mount is easy to align with the optional CG-5 polar scope , and GoTo's landed targets almost dead center on the camera after a 3-star alignment. The EQ head had very low backlash, and the whole package seems well built with attention to detail on the adjustment knobs, tripod construction, and even the counter weight design!

The CGEM just missed a 5 star rating due to a couple small gripes: the 2 lock knobs on the saddle plate can be hard to grip when tightened - especially with gloves on in the cold - and the available alignment star choices were somewhat limited until I got to the 3rd (calibration star. Still, the mount definitely met my expectations for performance and ease of use.

An excellent value! (Posted on 12/19/08)

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