CG-5 Computerized - GoTo convenience and GPS compatibility for precision accuracy
We are proud to offer
a computerized GoTo version of Celestron's sturdy CG-5 mount. Couple this solid mount with the included computerized control
system to utilize many of the same functions and features - like the NexStarcomputer control system and an Autoguider port for
long exposure deep sky astrophotography - as Celestron's most advanced GoTo telescopes.
GoTo models are also upgradeable to GPS with the optional CN16 GPS Accessory (#93966) allowing your telescope to pinpoint your
position on the earth, the date and
The C6S Advanced puts a new 6" Schmidt-Cassegrain optical tube on a robust German equatorial mount. It provides 44% greater light
gathering capacity than competitive 5" Maksutov-Cassegrain optics. Its faster f/10 focal ratio provides a larger exit pupil and
brighter images with any given eyepiece than the Maksutov's f/15 focal ratio, as well. The C6S comes standard with special
Starbright XLT multicoatings that are 16% brighter than even Celestron's industry-standard Starbright multicoatings. With a light
grasp 459 times that of even the sharpest dark-adapted eye, the compact C6S can reveal to you star clusters, nebulas, planets, and
galaxies in amazing detail.
The optical tube is the latest version of the Celestron-pioneered optical system that took phenomenally expensive
Schmidt-Cassegrain optics out of the hands of professional astronomers and made them available for the first time at a reasonable
price to all amateur astronomers. In essence, Celestron's innovative Schmidt-Cassegrain telescopes made modern amateur astronomy
possible. Today, this Celestron telescope is value-priced to make Schmidt-Cassegrain astronomy available to almost everyone. Its
light weight optical tube and easily assembled go-to mount make it easy to set up and enjoy - either in your back yard or at a
distant dark sky site. Superb optical quality and a very reasonable price make it a scope that virtually any beginning or advanced
astronomer can afford and enjoy.
C6S-GT XLT - Includes:
* 6" f/10 Schmidt-Cassegrain optics with Starbright XLT multicoatings;
* Heavy duty CG-5A German equatorial mount with setting circles, manual slow motion controls,
* Adjustable height tripod;
* Accessory tray;
* 6 x 30mm straight-through finder;
* 25mm 1.25" Pl�ssl eyepiece (60x);
* 1.25" visual back;
* 1.25" prism-type 90° star diagonal;
* Dust covers;
* TheSky Level 1 star-charting CD-ROM software.
* Two Year Warranty.
* Dual-axis DC slewing/tracking motors,
* Car battery adapter;
* Computer hand control with 40,000+ star and object database;
Details
* Schmidt-Cassegrain optical tube: 6" aperture (1500mm focal length f/10). State-of-the-art Starbright XLT
multicoated optics. Guaranteed diffraction-limited optical performance.
* Finderscope: 6 x 30mm straight-through achromatic design, with a wide 7 degree field of view. Focuses by loosening
the trim ring behind the objective lens cell, screwing the lens cell in or out to focus, and tightening the trim ring to lock in
the correct focus.
* 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 Pl�ssl (60x). The eyepiece field of view is 0.83° across (two-thirds larger than the full
Moon), for good lunar and deep space views.
* Software: The scope comes with a CD-ROM of TheSky Level 1 planetarium and star charting software. This Windows-based
program has a database of 10,000 stars and deep space objects. It will let explore the Universe on your PC and print out custom
star charts of the sky to help you find faint objects by star-hopping from object to object using your scope's slow motion
controls.
* Heavy duty CG-5A Advanced Series German equatorial mount: The mount has setting circles in both right ascension and
declination, manual slow motion controls, a latitude scale and fine adjustment controls in both altitude and azimuth, an 11 pound
counterweight, and more. Optional single-axis and dual axis DC drives/drive correctors are available for no-hands tracking of
celestial objects and long exposure photography. It is not possible to upgrade to a computerized go-to drive system.
* Adjustable height tripod: The tripod has 2" diameter steel legs with a center leg brace for rigidity, with 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.
* Dovetail slide bar: An adjustable dovetail slide bar allows the optical tube to be quickly and precisely balanced
fore and aft on the mount, 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.
* NexStar computer hand control with C6S-GT XLT: The supplied computerized hand control has a built-in database of
more than 40,000 stars and objects it can find and track for you. These include the complete RNGC, Messier, Caldwell, IC, and
Abell catalogs; selected SAO stars, including variable stars and multiple star systems; the planets, the Moon, and more.
All of the database and telescope 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. An RS-232 communication port on the hand control allows you to operate the telescope via a
personal computer.
Several different alignment methods are built into the NexStar computer, allowing you to choose a level of computer
accuracy in automatically finding objects with which you are comfortable. Both two and (more accurate) three star computer-guided
alignment methods are easily accomplished in only a few short minutes. You can be observing in less than 15 minutes after you
first take the scope outdoors, including telescope assembly time.
* Two-year warranty: All Celestron go-to telescopes have a two-year warranty, double that of competitive go-to scopes.
Celestron has brought its renowned StarBright technology to an even higher level of light transmission with the introduction of
our new optional StarBright XLT High Performance Optical Coating System.
StarBright XLT Optical System Design - You'll See The Light.
One of the most important factors in the evaluation of a Schmidt-Cassegrain telescope's optical system performance is its
transmission - the percentage of incoming light that reaches the focal plane. The design of the XLT System accomplishes two
crucial objectives: Develop a coating system that is optimized for visual use and for CCD/Photographic imaging.
The StarBright XLT System - What Makes It Different Makes It Better
There are three major components that make up our StarBright XLT high transmission optical system design:
1. Unique enhanced multi-layer mirror coatings
Our mirror coatings are made from precise layers of Aluminum (Al), SiO2 (quartz), TiO2 (Titanium Dioxide), and Si02. Reflectivity
is fairly flat across the spectrum, optimizing it for both CCD imaging and visual use. Click here to see a plot of the
reflectivity of XLT's Mirror Coatings.
2. Multi-layer anti-reflective coatings
Made from precise layers of MgF2 (Magnesium Fluoride), and HfO2 (Hafnium Dioxide) A rare element costing nearly $2000 per
kilogram, Hafnium gives us a wider band pass than Titanium, used in competing coatings. Click here to see a plot of XLT's
corrector transmission.
3. High Transmission Water White glass
Celestron Schmidt-Cassegrain optical systems with optional StarBright XLT coatings use Water White glass instead of Soda Lime
glass for the corrector lens. Water White glass transmits about 90.5% without anti-reflective coatings. That is 3.5% better
transmission than uncoated Soda Lime glass. When Water White glass is used in conjunction with StarBright XLT's anti-reflective
coatings, the average transmission reaches 97.4% - an 8% improvement! Click here to see a plot of water white glass versus soda
lime.*
These three components of our StarBright XLT coatings result in one of the finest coatings available. The peak transmission for
the systems is 89% at 520 nm. The overall system transmission is 83.5% averaged over the spectrum from 400 to 750 nm.
