User manual
Celestron CGEM II 800 EdgeHD 8"

User Manual for Celestron CGEM II 800 EdgeHD 8" f 10 Schmidt-Cassegrain GoTo Telescope

• Product category: Catadioptrics (Cassegrains) Celestron
• Brand: Celestron
• Description and content of package
• Technical information and basic settings
• Frequently asked questions – FAQ
• Troubleshooting (does not switch on, does not respond, error message, what do I do if...)
• Authorized service for Celestron Catadioptrics (Cassegrains)

Product description

• EdgeHD CGE 8" f/10 Aplanatic Schmidt-Cassegrain Telescope (OTA Only) Engineered to deliver sharp and clear distortion-free views, the Celestron EdgeHD CGE 8" f/10 Aplanatic Schmidt-Cassegrain Telescope is an ideal choice for observation, astrophotography, and imaging objects within or beyond our solar system. It features an aplanatic Schmidt-Cassegrain optical system consisting of a corrector plate, a spherical primary mirror, and a secondary mirror along with a set of field-flattening lenses integrated into the baffle tube. Complementing the EdgeHD system is the proprietary StarBright XLT optical coating system, which improves light transmission and reflectivity across the entire visual spectrum. The combination of EdgeHD and StarBright XLT produces bright and clear high-resolution images with true color rendition across the entire field of view without distortion, aberrations, or off-axis comas.Optimized for imaging, the internal focusing system features mirror support clutches to ensure proper alignment and mirror locks to avoid accidental defocusing during long-exposure astrophotography. The optical tube is outfitted with a standard 1.25" visual back to make it easier to find eyepieces, accessories, and imaging gear. For visual observations, a 1.25" star diagonal is included along with a 40mm Plössl eyepiece that yields 51x magnification. The EdgeHD 8" is offered here without a mount or tripod for users who already have a reliable support system and are looking to upgrade or add to their existing gear, but comes with a large CGE dovetail plate that is compatible with Losmandy-style saddles.
  Optical Tube
  • • 8" (203.2mm) aperture
    • f/10 focal ratio
    • 2032mm effective focal length
    • Aplanatic Schmidt-Cassegrain optical design
    • EdgeHD field-flattener aplanatic design eliminates spherical aberration, field curvature, and off-axis star coma to improve resolution, sharpness, and clarity across the entire field of view, especially at the edges
    • Diffraction-limited SCHOTT glass reduces internal light loss to improve color, clarity, and sharpness
    • StarBright XLT optical coatings
    • Flexible tension clutches hold the primary mirror in place to reduce image shift without putting any force or pressure on the mirror assembly, keeping subjects centered
    • Internal mirror locks prevent accidental adjustment to focus—important during long-exposure astrophotography
    • Integrated 95-micron mesh filter allows hot air to be released from behind the primary mirror without dust getting in, to prevent mirror distortion due to uneven surface temperatures
    • Resolution: 0.69 arcsec (Rayleigh); 0.57 arcsec (Dawes)
    • Secondary mirror obstruction: 2.7" (69mm); 34% by diameter; 11% by area
  StarBright XLT System
  • • Maximizes light transmission through optical path
    • Improves color rendition, contrast, sharpness, resolution, and brightness
    • Broadband system provides flat wavelength transmission across the entire visual spectrum
    • Multi-layer mirror coatings with layers of aluminum, SiO2 (quartz), and TiO2 (titanium dioxide)
    • Multi-layer anti-reflective corrector plate coatings with layers of MgF2 (magnesium fluoride) and HfO2 (hafnium dioxide); hafnium has a wider band-pass than the commonly used titanium
    • High-transmission water white glass corrector plate limits light loss due to internal absorption
  Mounting
  • • OTA only; mount and tripod required for proper use
    • Large CGE (Losmandy-style) dovetail plate
  Included Accessories
  • Visual Back:
    • Standard Schmidt-Cassegrain telescope (SCT) threads
    • 1.25" eyepiece/accessory holder
    • Use for prime focus or projection astrophotography with optional adapters
    Eyepiece:
    • Plössl lens configuration
    • 1.25"-diameter barrel
    • Accepts most 1.25" eyepiece filters
    • 40mm focal length yields 51x power
    Diagonal:
    • 90° angle puts head in comfortable viewing position
    • Threaded for direct connection to OTA without the need for the visual back
    • 1.25" eyepiece/accessory holder
    • Star diagonal corrects image horizontally, but not vertically
    Finderscope:
    • Low 9x magnification preserves wide field of view to more easily find alignment or guide stars
    • Large 50mm aperture helps to see dimmer objects and stars for easier star-hopping navigation
  UPC: 050234103091
• CGEM II GoTo EQ Mount with Tripod Celestron updates their venerable and versatile mid-level mount with the CGEM II GoTo EQ Mount. Engineered to carry a 40-pound payload and high-torque dual DC servo motors, it is able to smoothly and accurately slew and track heavier optical tube assemblies (OTAs) and rigs up to an 11" Schmidt-Cassegrain. Its Vixen/Losmandy dual dovetail saddle makes the mount compatible with most plates used today. Celestron also improves its usage by adding compatibility with their SkySync GPS unit for a higher level of precision during setup and alignment. To provide a stable platform for the mount and your OTA, a heavy-duty stainless steel tripod is included that sports large 2" legs and an accessory tray that doubles as a stabilizer.The brain of the CGEM II is the NexStar+ computer controller. Equipped with a database of 40,000 objects, including the planets, stars, nebulae, galaxies, and the complete Messier catalog, it can also be programmed with up 100 custom user-defined objects with filters added for custom object lists. Its intuitive menu-driven user interface provides the power to observe the heavens with nine slew speeds and three tracking rates, plus anti-backlash compensation and Permanent Periodic Error Correction (PPEC) for smoother movements in the motors and improved tracking over time. Features such as guided tours, extended information on 200 popular objects, and multiple alignment options make the NexStar+ controller easy to use and invaluable to new users and experienced stargazers.
  Mount
  • • German equatorial mount
    • 40-pound payload capacity
    • 15-70° latitude adjustment range
    • Dual-axis low-cog DC servo motors with optical encoders for smooth tracking and quiet operation
    • High-torque motors provide smooth tracking and slewing for heavy OTAs
    • Autoguider port for making corrections while astroimaging
    • Dual Vixen/Losmandy dovetail saddle, compatible with CG-5 and CGE bars
    • Long clutch levers make tightening and loosening of clutches easier for manual movement
    • Internal cables/wires for snag-free operation
    • GPS-compatible with optional SkySync unit
    • Runs on included 12 VDC, 3.2A car/vehicle power supply
  NexStar+ Hand Controller
  • • Features:
    • Intuitive menu-driven user interface
    • Nine Slew Speeds: 2x, 4x, 8x, 16x, 32x, 0.3°/sec, 1.0°/sec, 2°/sec, 4°/sec
    • Multiple Tracking Rates: Sidereal, Lunar, and Solar
    • Anti-Backlash Correction: Trains out intrinsic play in gears for smoother movement and tracking
    • Permanent Periodic Error Correction (PPEC): Improves tracking precision for long-exposure astrophotography and imaging
    • Database:
    • 40,000-object database
    • 100 user-defined objects for customization
    • Filters for creating custom object lists
    • Solar system: All seven planets plus the Moon, Sun, and Pluto
    • Custom lists of all the brightest stars, double stars, variable stars, and asterisms
    • Custom lists of all the best galaxies, nebulae, and clusters as well as the complete Messier catalog and select NGC objects
    • Functions
    • Alignment options: One- or Two-star, Solar system, Quick, and Last
    • Sky Tour: Based on location, date, and time, the system shows the best objects in the sky and automatically slews to them
    • Object Info: Provides useful information about the selected object such as magnitude and constellation; includes extended information about 200 popular objects
    • Physical characteristics:
    • 2-line, 16-character LCD window with red backlighting for comfortable viewing without affecting night-adjusted vision
    • 19 function keys, backlit in red
    • Micro-USB port: Connect to a computer, for use with software programs for point-and-click slewing capability and updating firmware via PC
  Tripod
  • • Stainless steel legs
    • Heavy-duty 2" diameter
    • Graduated markings on lower section for height repeatability
    • Accessory/eyepiece holder tray that doubles as leg spreader/lock
    • Weight: 20 pounds
  UPC: 050234915236

• 9x50 Finderscope

• 1.25" 90° Star Diagonal

• 1.25" 40mm Plössl Eyepiece

• Limited 2-Year Warranty

• NexStar+ AZ Hand Controller

• 17 lb Counterweight for the CGEM EQ Mount

• Stainless Steel Tripod

• Counterweight Shaft

• NexRemote Software DVD

• 12VDC Car/Vehicle Power Adapter

• Limited Two-Year Warranty

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Technical parameters

• EdgeHD CGE 8" f/10 Aplanatic Schmidt-Cassegrain Telescope (OTA Only)

  Optical Design	Aplanatic Schmidt-Cassegrain
  Aperture	8.0" / 203.2mm
  Focal Length	2032mm
  Focal Ratio	f/10
  Eyepiece Barrel Diameter	1.25"
  Diagonal	90° star 1.25" snout and eyepiece holder
  Finderscope	9x50
  Tripod	None
  Mount Type	CGE dovetail plate Compatible with Losmandy-style saddles
  Power Source	None
  Optical Tube Length	17.0" / 43.2 cm
  Weight	14.0 lb / 6.4 kg

  Box Dimensions (LxWxH)	26.0 x 16.0 x 14.0"

• CGEM II GoTo EQ Mount with Tripod

  Mount Type	Equatorial
  Load Capacity	40.0 lb / 18.1 kg
  Motor	Dual-axis low-cog DC servo
  GO-TO Capability	Yes, NexStar+ hand controller
  Latitude Adjustment Range	15 - 70°
  Polar Axis Scope	None
  Includes Tripod/Pier	Adjustable-height stainless steel 2"-diameter legs
  Power Source	12 VDC, 3.2 amps
  Weight	Mount: 40.0 lb / 18.1 kg Tripod: 20.0 lb / 9.1 kg Total: 77.0 lb / 34.9 kg

  Box Dimensions (LxWxH)	42.5 x 19.8 x 13.1"

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