Celestron CGX 800 8″ F/2 RASA GoTo Telescope(Celestron Cgx 800 8 F 2 Rasa Goto Telescope)

• 203mm (8″) diameter aperture enables near- and deep-sky viewing without being prohibitively large or heavy for easy transport to viewing locations
• 400mm focal length helps to produce a fast focal ratio
• Fast f/2.0 focal ratio requires significantly lower exposure times versus slower ratios to produce the same results
• Rowe-Ackermann Schmidt astrograph (RASA) design is purpose built for astrophotography and imaging performance, and is not recommended for visual use
• Proprietary StarBright XLT fully multi-coated optical system
• Four-element rare-earth glass for true color rendition without aberrations across the entire field of view
• Wide 390-800nm spectral range improves images of deep space objects like galaxies and nebulae
• Image circle: 22mm (0.86″)
• Resolution: 0.68 arcsec (Rayleigh), 0.57 arcsec (Dawes)
• Back focus: 25mm (0.98″) with included camera adapter, 29mm (1.14″) from top of threaded collar
• Optical window can be removed and replaced with optional filters such as a light pollution filter
• Integrated cooling fan brings optical system to ambient air temperature for better performance
• Runs on eight user-supplied AA batteries or optional 12VDC power adapter

• Multi-layer mirror coatings made from layers of aluminum, SiO2 (silicon dioxide), and TiO2 (titanium dioxide)
• Reflectivity is flat across the light spectrum, for both astrophotography/astro-imaging
• Multi-layer anti-reflective coatings made from layers of MgF2 (magnesium fluoride) and HfO2 (hafnium dioxide)
• High-transmission water white glass corrector lens with 97.4% light transmission

• Focusing system moves primary mirror forward and back to achieve tack-sharp images
• Ultra-stable design minimizes unwanted lateral movement of the primary mirror when focusing or slewing
• Fine adjustments for precise focusing, approximately 30 turns of the knob runs through the focus range

• OTA only, mount and tripod required for proper use
• Includes large CGE/Losmandy-D dovetail plate for use on larger more stable mount heads
• Weight: 17 pounds

• Standard M42 camera T-adapter accepts most camera-specific T-rings to directly mount DSLR and mirrorless cameras
• CCTV/Imager C-thread adapter accepts most camera-specific video T-rings to mount imaging and video cameras
• Battery pack takes eight user-supplied AA batteries to power the integrated cooling fan

• German equatorial mount, when properly polar aligned, provides precise tracking on the Right Ascension axis allows the optical tube to follow objects without field rotation�making it ideal for astrophotography and imaging
• 55 lb payload capacity
• 3 to 65° latitude adjustment range
• 20° of additional tracking past the meridian provides greater usability
• Dual-axis servo motors with optical encoders for smooth tracking and quiet operation
• High-torque motors provide smooth tracking and slewing for heavy OTAs
• Internal belt-drive system provides smooth, vibration-free tracking while minimizing backlash
• Spring-loaded brass worm wheel and stainless steel worm gear reduce friction and improve gear meshing
• Limit sensors automatically shut off slewing or tracking before reaching the hard stop fail-safe
• Internal hard stops for both axes prevent cable tension and tripod strike
• 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 “Real Time Clock” keeps time and site information saved when power is turned off
• Internal cables/wires for snag-free operation
• Runs on included 12 VDC, 4A car/vehicle power supply

• Intuitive menu-driven user interface
• Nine slew speeds: 2x, 4x, 8x, 16x, 32x, 0.3°/sec, 1.0°/sec, 2°/sec, 4°/sec
• Three 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

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, 18-character LCD window with red backlighting for comfortable viewing without affecting night-adjusted vision
• 19 function keys, backlit in red
• Mini-USB port: Connect to a computer, for use with software programs for point-and-click slewing capability and updating firmware via PC

• 40,000-object database
• 400 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