If you're looking for a large aperture Telescope
phenomenal value, consider Celestron C11 S Schmidt-Cassegrain Telescope with CG-5 German Equatorial Mount
The largest aperture Celestron
in the series, this new Celestron 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 Celestron C 11 S Telescope
won't break your bank or your back. Equipped with 2"
, this heavy duty mount delivers jitter-free images.
With adjustable height, very rigid Celestron C11-S Telescopes ' 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.
makes it easy to point, balance and use.
Celestron 11" Advanced Telescopes
' 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 CG-5 mounted C 11 S Schmidt Cassegrain Celestron
C11-S Schmidt-Cassegrain Celestron
come with StarBright coatings.
And Celestron C11 S Schmidt-Cassegrain Telescope
come with revolutionary Celestron StarBright XLT Coating System
Please note that Celestron C11 S XLT Telescope w/ StarBright XLT Coatings 11066-XLT has been replaced with Celestron C 11 SGT XLT Telescope w/ StarBright XLT Coatings 11067-XLT
With StarBright XLT Optical System you'll see the light!
One of the most important factors in the evaluation of a Schmidt-Cassegrain
Telescopes 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.
There are three major components that make up Celestron
Star Bright XLT high transmission optical system design:
1. Unique enhanced multi-layer mirror coatings:
mirror coatings are made from precise layers of Al (Aluminum), SiO2 (quartz) and TiO2 (Titanium Dioxide). Reflectivity is fairly flat across the spectrum, optimizing it for both CCD imaging and visual use.
2. Multi-layer anti-reflective coatings:
Star Bright XLT
Coatings are made from precise layers of MgF2 (Magnesium Fluoride), and HfO2 (Hafnium Dioxide). Hafnium gives a wider band pass than Titanium, used in comparable coatings.
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% of light 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 light transmission reaches 97.4% " an 8% improvement!
These three components of Celestron StarBright XLT Coatings result in one of the finest coatings available. The
peak light transmission for the systems is 89% at 520 nm. The overall system
transmission is 83.5% averaged over the spectrum from 400 to 750
Specifications for Celestron C 11 S Telescopes:
Features of Celestron 11" Schmidt-Cassegrain Advanced Telescopes:
|Optical Design: || 11" (279mm) Schmidt-Cassegrain|
|Focal Length: || 2800mm|
|Focal Ratio: || f/10|
|Coatings: || StarBright Multi-Coatings|
|Eyepiece: || 1.25" 40mm E-Lux Eyepiece (70x)|
|Finderscope: || 9x50|
|Tube Color: || Glossy Black|
|Telescope Weight: || 91 lbs|
- StarBright Multi-Coatings
- Adjustable 2" Steel Leg Tripod with Accessory Tray/Leg Brace
- CG-5 Heavy Duty German Equatorial Mount
- Right Ascension and Declination Setting Circles
- Slow Motion Control Knobs on Both Axes
- Celestron C11 S Schmidt-Cassegrain Telescope
- 1-1/4" 40mm E-Lux Plossl Eyepiece (70x)
- 9x50 Finderscope and Mounting Bracket
- CG-5 Equatorial Mount and Tripod
- Three 11# Counterweights
- Star Diagonal - 1.25"
- The Sky Level I CD-ROM
- Accessory Tray