Celestron Advanced Telescopes

More Information  · Supplied Accessories  · Recommended Accessories  · Images of Some Features Price $2,099.00 List Price $3,797.95 Highest Useful Magnification 406x Visual Limiting Magnitude 14 Focal Length 2032mm Focal Ratio f/10 Resolution 0.57 arc seconds Aperture 8" Weight 88 lbs. Heaviest Single Component 41 lbs. Warranty 2 years

   Starbright XLT optics
   NexStar CGEM computer
   CGEM mount

This Telescope’s Optical System . . .

• Schmidt-Cassegrain optical tube: 8" aperture (2032mm focal length f/10). Guaranteed diffraction-limited optical performance. The 17" long aluminum optical tube weighs only 13 lbs., making it easy to transport and assemble the scope in the field.

• Starbright XLT fully multicoated optics: This high transmission/high reflectivity optical coatings package gives you visibly higher light transmission for brighter deep space images and shorter exposure times during CCD and 35mm photography. It also increases the contrast on subtle lunar, planetary, and nebula details when compared with a scope with ordinary coatings or multicoatings. For more details, click on the “Starbright XLT" icon above.

• Focusing: Focusing is accomplished by turning a knob at the rear of the scope body that moves the primary mirror fore and aft along a central baffle tube to adjust the focus. The Celestron focusing mechanism is supported by two pre-loaded ball bearings, minimizing the “mirror flop" typical of bushing focus mechanisms that causes image shift during critical focusing.

• Finderscope: 6 x 30mm straight-through achromatic design, with a wide 7 degree field of view.

• Visual back: Removable 1.25" visual back holds visual accessories such as star diagonal, tele-extender, etc.

• Star diagonal: 1.25" prism type.

• Eyepiece: 1.25" 25mm Plössl (81x). The eyepiece field of view is 0.62 degrees, over 20% larger than the full moon.

This Telescope’s Mount . . .

• Heavy duty CGEM computerized German equatorial mount: The CGEM mount includes dual-axis slewing/tracking motors on each axis for go-to computer control. There are nine motor drive speeds: 0.5x and 1x sidereal for guiding; 4x, 8x, 16x, and 64x for centering; and 0.5°, 2°, and a fast 4° per second for slewing. Preset tracking rates include sidereal, solar, and lunar for precise tracking of celestial objects inside the solar system as well as out in deep space.

• Powering the CGEM-800: The mount comes with a car battery cord to operate from the cigarette lighter plug of your car or from a rechargeable 12VDC battery pack. The 17 amp hour capacity Celestron Power Tank #4517V is recommended and will operate the scope all night long without danger of running out of power.

• Polar alignment: To make a casual polar alignment for visual use quick and easy, there’s a latitude scale with large ergonomically-friendly altitude and azimuth adjustment knobs. No polar alignment finderscope is available to aid in the precise polar alignment required for long exposure astrophotography, nor is any needed. A unique Celestron All-Star Polar Alignment program built into the NexStar hand control helps you do a very precise computerized polar alignment in mere minutes, using any bright star, even when Polaris is hidden by trees or buildings. It works in both northern and southern hemispheres.

• Adjustable height tripod: The tripod has 2" diameter stainless steel legs with a metal center leg brace for rigidity, for excellent vibration damping characteristics. The center leg brace is drilled to form a convenient accessory tray that holds 1.25" and 2" eyepiece to keep them up out of the dew-soaked grass.

• Mounting the scope: A dovetail slot on the top of the mount holds the long dovetail slide bar mounted under the optical tube. This allows you to slide the optical tube fore and aft in the dovetail slot to quickly and precisely balance the optical tube in declination when you add or subtract accessories, eliminating the need for an extra counterweight to balance a camera or other accessories. Setup and takedown times are exceptionally fast, as a single large hand-tighten knob holds the optical tube in place. A second lock knob prevents the tube from sliding off the mount should the hand-tighten knob loosen. The oversized dovetail mounting platform assures secure vibration-free tube attachment.

• Balancing the scope: The single sliding 17 pound counterweight is locked in place on the counterweight shaft with a single large hand-tighten knob. This makes it easy to rebalance the scope in right ascension if you add heavy photographic accessories. For more details, click on the “CGEM mount" icon above.

• NexStar computer hand control: The supplied NexStar computer hand control has a built-in database of more than 40,000 stars and objects that it can find and track for you. These include the complete RNGC, Messier, Caldwell, IC, and Abell catalogs; selected SAO stars; the planets, the Moon, and others. The custom database lists of all the most famous deep-sky objects by name and catalog number; the most beautiful double, triple and quadruple stars; variable stars; non-planetary solar systems objects; and asterisms.

• The NexStar display: All of the database and scope operation information is displayed on a double line, 16-character, liquid crystal display on the hand control. There are 19 fiber optic backlit LED buttons to make it easy for you to control the computer without affecting your dark-adapted vision. The NexStar hand control provides a constant and easily-visible illuminated right ascension and declination readout of the scopes position on the sky. This provides much greater accuracy than conventional (and hard to see at night) manual setting circles for star-hopping or locating objects by their celestial coordinates alone, should you want to observe the old-fashioned way without using the computer to find objects for you.

• Some NexStar features: The software built into the NexStar hand control includes many, many features and programs discussed at greater length by clicking on the “NexStar CGEM" icon above. An RS-232 communication port on the hand control allows you to operate the telescope via a personal computer using the supplied RS-232 cable and NexRemote software CD-ROM. The hand control and motor control software is flash-upgradeable to allow you to download the latest product updates over the Internet to keep your CGEM mount always at the cutting edge of technology. An autoguider port is located on the electronic pier for guided, but unattended, long exposure astrophotography.

• Aligning on the sky: Five different alignment methods are built into the NexStar computer – 2-star align, quick align, 1-star align, last alignment, and solar align – allowing you to choose a level of computer accuracy in automatically finding objects with which you are comfortable. Alignment is easily accomplished in only a few short minutes. You can be observing in less than 15 minutes after you first take the scope outdoors. There’s even a new and unique “All-Star" software-assisted alignment of the mount’s polar axis using a single bright star that will have you ready for imaging before it’s even dark enough to see the North Star. For more details, click on the “NexStar CGEM computer" icon above.

• Two-year warranty: All Celestron go-to telescopes have a two-year warranty, double that of competitive go-to scopes.