CGEM / CGEM DX Mount

share:

“Ideal for lunar and planetary imaging, the scope also makes an impressive fast wide-field deep sky imager.”

Pete Lawrence – Sky at Night, November 2011

“The CGEM DX is Beauty and The Beast all wrapped in one. It has attractive stylings and a refined handset paired with robust performance and a ridiculously sturdy tripod. It would be at home in any astronomy environment, be it observing or imaging.”

Austin Grant – Astronomy Technology Today, January/February 2012 read more »

  • Sky & Telescope Hot Product 2010 CGEM Mount
  • Astronomy Magazine Star Product 2010 CGEM Mount
  • Astronomy Magazine Star Product 2011 CGEM DX 1400 HD

Mechanics

  • Hefty 40mm diameter steel shafts supported by four heavy duty bearings on each axis (RA axis uses 3x 80mm O.D. sealed ball bearings and 72mm O.D. tapered roller bearing, Dec. axis uses 3x 68mm O.D. sealed ball bearings and 62mm O.D. tapered roller bearing) provide stability and smooth movement
  • Steel worm gear and large 90 mm pitch diameter brass worm wheel on both axes, worm gears and worm wheels lapped together as a set for smoothest tracking performance
  • Utilizes the wide CGE dovetail for less flexure between mount and OTA
  • Mount structure made of cast aluminum with precision machined surfaces
  • Ergonomic altitude and azimuth adjustment knobs for quick and easy polar alignment adjustment.
  • Ultra sturdy 2″ steel tripod with Accessory Tray (CGEM)
  • Heavy duty 2.75” diameter stainless steel tripod legs, height adjustable from 38 – 55″, uses a dual leg support for maximum rigidity with an upper leg brace to provide an outward preload and a lower leg brace providing inward tension, large metal accessory tray (CGEM DX)
  • Latitude range: 15° to 70°

Electronics

  • Permanent Programmable Periodic Error Correction (PEC) – Indexed worm gear is used to correct for periodic tracking errors inherent to all worm drives
  • Drive Motors – DC servo motors with integrated optical encoders offer excellent performance and long life, motor armatures are skewed to minimize cogging during low speed operation, maximum slew rate over 5° per second
  • Motor resolution = 0.14 arcseconds
  • 2.8A motor driver chips provide extra power for heavier loads (CGEM DX)
  • Autoguider port (ST-4 compatible) and Auxiliary ports located on the electronic plate provide easy connections for a wide variety of applications
  • Supports autoguiding commands from PC to hand controller with addition of ASCOM driver – this allows autoguiding with simple webcams
  • Internal cable wiring for trouble-free setup and transportation
  • Internally regulated voltage, reverse polarity protection
  • Real Time Clock keeps track of current time automatically
  • RS-232 communication port on hand control to control the telescope via a personal computer
  • Threaded barrel connector on power jack prevents unintentional power cable pull out
  • Double line, 16-character Liquid Crystal Display hand control with backlit LED buttons for easy operation of goto features
  • Utilizes three PIC18 microprocessors (PIC18F85J10 in hand controller, 2x PIC18F2520 in motor controller), large memory capacity for software expansion/upgrades
  • GPS enabled with optional SkySync GPS Accessory

Software

  • New “All-star” Polar alignment uses any bright star for a quick and accurate Polar alignment
  • Extended tracking past the Meridian of up to 20 degrees of uninterrupted imaging through the best part of the sky, this makes setting up your shot much easierI
  • Internet upgradeable hand control software and motor control units for downloading product updates over the Internet
  • Custom Rate 9 feature allows you set maximum slew rate
  • Tandem mode allows use of two OTAs at once
  • Adjustable slew limits
  • Five alignment methods
  • Hibernate feature saves your prior alignment
  • Proven NexStar computer control technology
  • 40,000 object database with over 100 user-definable objects and expanded information on over 200 objects
  • Database filtering

Performance

  • Celestron’s CGEM mount is the perfect fit between the Advanced Series and CGE Pro Series, offers all the features and functionality required for easy long-exposure imaging
  • Holds a maximum instrument capacity of 40 lbs (CGEM)
  • Holds a maximum instrument capacity of 50 lbs (CGEM DX)

CGEM Specifications

  • Payload Capacity: 40 lbs (18.14 kg)
  • Motor Drive: Low cog DC Servo motors with encoders, both axes
  • Computer Hand Control: Double line, 16 character Liquid Crystal Display; 19 backlit LED buttons
  • Slew Speeds: Nine slew speeds: 5 °/sec, 2 °/sec, 1 °/sec, 64x, 16x, 8x, 4x, 1x, .5x
  • 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
  • Database: 40,000+ objects, 100 user defined programmable objects. Enhanced information on over 200 objects
  • Internal Clock: Yes
  • Power Requirements: 12VDC 3.2A
  • GPS: Optional SkySync GPS Accessory
  • Tripod Weight: 17 lbs (7.71 kg)
  • Mount Weight: 41 lbs (18.6 kg)
  • Counterweights: 1 x 17 lbs
  • Latitude Range: 15° to 70°

CGEM DX Specifications

  • Payload Capacity: 50 lbs (22.68 kg)
  • 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: 5 °/sec, 2 °/sec, 1 °/sec, 64x, 16x, 8x, 4x, 1x, .5x
  • 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
  • Database: 40,000+ objects, 100 user defined programmable objects. Enhanced information on over 200 objects
  • Internal Clock: Yes
  • Power Requirements: 12VDC 3.5A
  • GPS: Optional SkySync GPS Accessory
  • Tripod Weight: 45 lbs (20.41 kg)
  • Mount Weight: 41 lbs (18.6 kg)
  • Counterweights: 1 x 22 lbs
  • Latitude Range: 15° to 70°