Celestron CGEM II 800 203mm f/10 Schmidt-Cassegrain GoTo Telescope

BH #CECGEMII800T • MFR #12010/OLD
Celestron CGEM II 800 203mm f/10 Schmidt-Cassegrain GoTo Telescope
Key Features
  • 203mm Schmidt-Cassegrain OTA
  • 2032mm Focal Length, f/10 Focal Ratio
  • CGEM II Motorized Equatorial Mount
  • NexStar+ Computer Controller
With a large aperture and a long effective focal length despite its short physical length, combined with a sturdy and precise mount, the Celestron CGEM II 800 203mm f/10 Schmidt-Cassegrain GoTo Telescope is an ideal rig for both celestial observation and astrophotography. It comes with the Schmidt-Cassegrain telescope (SCT) optical tube, a solid motorized equatorial mount, the venerable NexStar+ computer hand controller, an eyepiece, and a 90° star diagonal. Whether you're conducting planetary or deep-space viewing or imaging, the CGEM II 800 provides the performance and portability you need.

Celestron CGEM II 800 Overview

With a large aperture and a long effective focal length despite its short physical length, combined with a sturdy and precise mount, the Celestron CGEM II 800 203mm f/10 Schmidt-Cassegrain GoTo Telescope is an ideal rig for both celestial observation and astrophotography. It comes with the Schmidt-Cassegrain telescope (SCT) optical tube, a solid motorized equatorial mount, the venerable NexStar+ computer hand controller, an eyepiece, and a 90° star diagonal. Whether you're conducting planetary or deep-space viewing or imaging, the CGEM II 800 provides the performance and portability you need.

Celestron C8-A-XLT CGE 8" f/10 Schmidt-Cassegrain Telescope (OTA Only)

Striking a comfortable balance between power and portability, the Celestron C8-A-XLT CGE 8" f/10 Schmidt-Cassegrain Telescope is an ideal choice for observing objects within or beyond our solar system. It features a Schmidt-Cassegrain optical system consisting of a corrector plate, a spherical primary mirror, and a secondary mirror that work together to reduce spherical and chromatic aberrations. These corrections result in crisp and clear high-resolution images with accurate color representation, without distortion—especially at the edges. Complementing the optical system is the proprietary StarBright XLT optical coating system, which improves light transmission and reflectivity across the entire visual spectrum.

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 25mm eyepiece that yields 81x magnification. The C8-A-XLT 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 larger CGE dovetail plate that is compatible with Losmandy-style saddles.

Optical Tube

  • 8" (203mm) aperture
  • f/10 focal ratio
  • 2032mm effective focal length
  • Schmidt-Cassegrain catadioptric optical design
  • StarBright XLT optical coatings
  • Resolution: 0.69 arcsec (Rayleigh); 0.57 arcsec (Dawes)
  • Secondary mirror obstruction: 2.5" (69mm); 31% by diameter; 9.77% 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

  • optical tube assembly (OTA) only; mount and tripod required for proper use
  • CGE (Losmandy-style) dovetail plate for compatible saddles
  • OTA weight: 12.5 pounds

Included Accessories

  • Visual back:
  • Standard Schmidt-Cassegrain telescope threads
  • 1.25" eyepiece/accessory holder
  • Use for prime focus or projection astrophotography with optional adapters
  • Eyepiece:
  • 1.25"-diameter barrel
  • Accepts most 1.25" eyepiece filters
  • 25mm focal length yields 81x 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" snout and eyepiece/accessory holder
  • Star diagonal corrects image horizontally, but not vertically
  • Finderscope:
  • Low 6x magnification preserves wide field of view to more easily find alignment or guide stars
  • 30mm aperture helps to see dimmer objects and stars for easier alignment and star-hopping navigation
UPC: 050234102490

Celestron 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

Celestron C8-A-XLT CGE 8" f/10 Schmidt-Cassegrain Telescope (OTA Only) Specs

Optical DesignSchmidt-Cassegrain
Aperture8.0" / 203.2mm
Focal Length2032mm
Focal Ratiof/10
Eyepiece Barrel Diameter1.25"
Diagonal90° star
1.25" snout and eyepiece holder
Finderscope6x30 mm
TripodNone
Mount TypeCGE dovetail plate
Compatible with Losmandy-style saddles
Power SourceNone
Optical Tube Length17.0" / 43.2 cm
Weight12.5 lb / 5.7 kg
Packaging Info
Package Weight21 lb
Box Dimensions (LxWxH)23 x 15.4 x 13.9"

Celestron CGEM II GoTo EQ Mount with Tripod Specs

Mount
Mount TypeGerman Equatorial
GoTo CapabilityYes, NexStar+
Payload Capacity40 lb / 18.1 kg
MotorDual Axis
Tracking RatesLunar, Sidereal, Solar
Latitude Adjustment15 to 70°
Counterweight1 x 17.0 lb / 7.7 kg
Polar Axis ScopeNone
Tripod
Leg Diameter2" / 5.1 cm
Leg Sections2
General
Power SourceVehicle Adapter (Included)
DC Input Power12 VDC
MountingTo Optical Tube Assembly: Dual Losmandy-/Vixen-Type Saddle
GPSNo
Wi-FiNo
MaterialsSteel (Tripod)
DimensionsNot Specified by Manufacturer
Weight40 lb / 18.1 kg (Mount)
20 lb / 9.1 kg (Tripod)
77 lb / 34.9 kg (Fully Assembled)
Packaging Info
Package Weight90.5 lb
Box Dimensions (LxWxH)42.5 x 19.8 x 13.1"
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