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Celestron C-11 A Telescopes w/ FREE UPSCelestron 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'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.
Celestron C 11 A Schmidt-Cassegrain Telescopes Optical Tube available models:
- 91067-XLT: Celestron C-11A Schmidt Cassegrain Telescope 11" Optical Tube w/ Star Bright XLT Coating, w/ dovetail slide bar made to fit Celestron CG-5 Mount
- 91036-XLT: Celestron C-11 A Schmidt-Cassegrain Optical Tube w/ StarBright XLT Coatings
With 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.
There are three 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 '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
nm.
Click here to see details
about StarBright XLT.
Specifications for
Celestron-C-11-A Telescopes:
 |
| Optical 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) |
|
Features of CelestronC11A
Telescopes:
- Limiting stellar magnitude of 14.7
- Focus as close as 60' (18 m) for terrestial viewing
- Secondary mirror obstruction of 13.2%(by area)
- Aluminum tube materials
Package Contents:
- Celestron-C 11" A Telescope
- 9x50mm Finderscope
- 26mm (107x) Plossl Eyepiece (1.25")
- Star Diagonal and Visual Back
- Dovetail Slide Bar
|
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Celestron C-11 A Telescopes w/ FREE UPS : CI-TS-C11AThe following options are available:
91067-XLT: Celestron C 11 A (XLT) SCT 11'' Optical Tube w/ StarBright XLT Coating , UPC: 050234910361
91036-XLT: Celestron C 11 A (XLT) Schmidt Cassegrain Telescope optical Tube - w/ StarBright XLT coatings , UPC: 050234103695
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