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
If you're looking for a large aperture telescope for a phenomenal value, consider the C11-S telescope. The largest aperture
Advanced telescope in the series, this new 11" Schmidt-Cassegrain optical system is mounted on the CG-5 EQ mount, which features
precision worm gears for extremely smooth motion. And with the heaviest component under 30 lbs this telescope won't break your
bank or your back. Equipped with 2" steel legs, this heavy duty mount delivers jitter-free images. With adjustable height, the
very rigid tripod has excellent damping characteristics and a convenient metal accessory tray/leg brace for added strength.
Included are setting circles on both axes, slow-motion controls and latitude scale. Adjustable counterweights makes it easy to
point, balance and use. The C11-S optical system comes with StarBright® coatings and its large aperture offers light gathering
power 1593 times that of the human eye and 89% more than our 8" model. An optional polar alignment scope for quick alignment as
well as a motor drive is available for easy tracking for all CG-5 mounted telescopes.
C11S-GT - Includes:
* 11" Schmidt-Cassegrain
* 2800mm Focal Length, f/10
* StarBright Multi-Coatings or optional Starbright XLT Coatings
* Adjustable 2" Steel Leg Tripod with Accessory Tray/Leg Brace
* Right Ascension and Declination Setting Circles
* Slow Motion Control Knobs on Both Axes
* 1-1/4" 40mm Plossl Eyepiece (70x)
* 9x50 Finderscope and Mounting Bracket
* CG-5 Equatorial Mount and Tripod
* Three 11# Counterweights
* Star Diagonal - 1-1/4"
* The Sky Level I CD-ROM
* Accessory Tray
* Telescope Weight: 91 lbs
* Duel-Axis slew motors,
* Computerized Hand Control with 40,000+ objects database,
* Car battery adapter
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.
