Celestron CGEM II 800 8″ F/2 Rowe-Ackerman Schmidt Astrograph GoTo Telescope(Celestron Cgem Ii 800 8 F 2 Rowe Ackerman Schmidt Astrograph 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

• 40-pound payload capacity
• Uninterrupted tracking below meridian to enable observation from a raised location such as a balcony or hilltop
• Internal cables eliminate snag hazards in the dark or when operating the mount remotely
• Counterweight bar with 17-pound counterweight allows you to properly balance your OTA with accessories and imaging systems
• Dual CG-5 (Vixen) and CGE (Losmandy) dovetail saddle make it compatible with most large and small OTAs on the market
• Dedicated autoguider port for making corrections when astroimaging
• Runs on the included 12V DC power cord

• Dual-axis low-cog DC servo motors
• High-torque motors for helping to smoothly drive heavier loads
• Dual motor encoders improve tracking and location accuracy with reduced vibrations
• Clutch levers for manual movement, levers are longer than normal to make tightening and loosening easier

• 40,000+ object database with filters for creating custom object lists
• 100 user-defined programmable celestial or terrestrial objects
• Enhanced information on over 200 objects
• Nine slew speeds: 4°/sec, 2°/sec, 1°/sec, 0.3°/sec, 32x, 16x, 8x, 4x, 2x
• Three tracking rates: Sidereal, Solar, Lunar
• Solar System alignment method allows to view the moon and planets during the day
• Built-in polar alignment program to polar align on any star in the sky
• Sky Tour Mode: System seeks out the best objects for the date and time and automatically slews to them
• Identify Mode: Use to identify an unknown object in the field of view, or to find other celestial objects that are close to where the user is viewing
• Anti-backlash compensation: Trains out the intrinsic play between gears for more precise slewing and tracking
• Permanent Periodic Error Correction (PPEC): System learns its internal tracking errors and improves over time for more precise tracking, requiring fewer corrections
• Built-in instructions guide you through the alignment procedures
• 4-line, 18-character LCD display with a 19-summary fiber-optic backlit LED keypad
• RS-232 communication port on hand control to control the telescope via a personal computer
• Supports English, French, Italian, German, and Spanish

Database Details:

• Solar system: Seven planets, moon, sun, and Pluto
• Custom lists of all the brightest stars, double stars, variable stars, and asterisms
• Custom lists of galaxies, nebulae, and clusters, as well as the complete Messier catalog and select NGC objects