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Celestron C11-A XLT Optical Tube Assembly Product Description
Celestron C 11 A Telescopes Product InfoCelestron C 11 A is 11.0 /279mm Aluminum Schmidt Cassegrain Telescope Optical Tube Assembly 2800mm f/10.0 Now you can have your own a la carte assemblage of your preferred optical tube and mount. Celestron C11A Schmidt Cassegrain Telescopes utilize the multicoated Starbright coatings group. Highly reflective coatings are used on the mirrors, with anti reflective coatings employed on the correcting lens for increases in light transmission. Celestron 39 s optical systems internal baffling ensures the highest contrast levels. To provide consistent customer satisfaction and high performance, CelestronC11 A Optical Assembly utilizes the same superior optics regardless of their size or configuration.
With StarBright XLT Optical System Design you 39 ll see the light.1 of the most important factors in the evaluation of a Schmidt Cassegrain telescope 39 s optical system performance is its transmission the percentage of incoming light that reaches the focal plane. The design of the XLT System accomplishes 2 crucial objectives Develop a coating system that is optimized for visual use and for CCD/Photographic imaging.There are 3 major components that make up Celestron StarBrightXLT high transmission optical system design 1. Unique enhanced multi layer mirror coatings Celestron 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 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 39 s anti reflective coatings, the average light transmission reaches 97.4% an 8% improvement!These 3 components of Celestron StarBright XLT coatings result in 1 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 nm.
Specifications for Celestron C 11 A TelescopesOptical Design | Schmidt Cassegrain | |
Optical Diameter | 11.0 279mm | |
Focal Length | 110.2 2800mm | |
Focal Ratio | f/10 | |
Maximum Useful Magnification | 660x | |
Resolving Power arc seconds | 0.41 | |
Optical Coatings | Starbright or StarBright XLT coatings | |
Optical Tube Dimensions | 24.0 61.0 cm Long | |
Eyepiece Barrel Diameter | 1.25 | |
Finderscope | 9x50mm | |
Weight | 27.50 lb 12.48 kg | |
- Limiting stellar magnitude of 14.7
- Focus as close as 60 39 18 m for terrestial viewing
- Secondary mirror obstruction of 13.2% by area
- Aluminum tube materials
- Celestron C 11 A Telescope
- 9x50mm Finderscope
- 26mm 107x Plossl Eyepiece 1.25
- Star Diagonal and Visual Back
- Dovetail Slide Bar