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Celestron Professional CGEM II 800 EdgeHD 8" F/10 Aplanatic Schmidt-Cassegrain GoTo Astronomical Telescope EQ Mount with Tripod
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Celestronprovides a complete astronomical observation platform, including their updated mount, with theCGEM II 800 EdgeHD 8" f/10 Schmidt-Cassegrain GoTo Telescope. This rig comes with everything you need to start making detailed observations of the Moon, planets, and deep-sky objects such as galaxies, nebulae, clusters, and stars. It comes with an 8" aperture Schmidt-Cassegrain optical tube assembly, the NexStar+ computer controller, the CGEM II motorized EQ mount, a 1.25" 40mm eyepiece that produces 51x, a 1.25" 90° diagonal, and a heavy-duty stainless steel tripod.
Engineered to deliver sharp and clear distortion-free views, theCelestron EdgeHD CGE 8" f/10 Aplanatic Schmidt-Cassegrain Telescopeis 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.
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
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
OTA only; mount and tripod required for proper use
Large CGE (Losmandy-style) dovetail plate
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
Celestronupdates their venerable and versatile mid-level mount with theCGEM 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.
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
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
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
Model Number : 12017
Field of View : F10
Objective Lens Diameter : 2032mm
Brand Name : celestron
Type : Binoculars
Origin : CN(Origin)
Eyepiece diameter : 40mm
Magnification : 1000x
