About the Celestron C11-A XLT Schmidt-Cassegrain OTA - 11" SCT Optical Tube Assembly...
Celestron Telescope Schmidt-Cassegrain Optical Tube Assemblies (OTA) are available individually to be used with your favorite mount. Each Celestron C11-A XLT is made to the same exacting standards as those used on all their high quality telescopes. All optical surfaces are coated with StarBright XLT coatings. These Celestron Telescope tube assemblies are equipped with the same dovetail mounting bar as used on the C-5 series for easy attachment to a variety of popular Celestron Telescope Mounts and Tripods.
Weighing only 27.5 lbs., the C11-A XLT Schmidt-Cassegrain OTA - 11" SCT Optical Tube Assembly is still portable enough to be taken to dark skies, but it has 89% more light gathering power than an 8" Celestron Telescope. Using an f/6.3 Focal Reducer makes it usable with a wide variety of Celestron CCD Cameras. As a visual instrument you can search for all of the Messier Catalog, NGC, IC and Caldwell objects. Turn this scope to the planets and see amazing detail on the surface of Jupiter; see Cassini'''s Division in the rings of Saturn, and resolve details on the surface of Mars. Even the distant Uranus, Neptune and Pluto are within your reach.
Celestron C11-A XLT Schmidt-Cassegrain OTA - 11" SCT Optical Tube Assembly Features...
- 11" Schmidt-Cassegrain Optical Tube Assembly
- Aluminum Optical Tube
- Celestron'''s premium StarBright XLT coatings
- 2800 mm focal length (f/10)
- 40 mm eyepiece included (70x)
- Visual back allows for use with 1.25" accessories
- 9x50 finderscope to help accurately find objects
- Star diagonal provides more comfortable viewing position when observing objects that are high in the sky
- Includes dovetail rail compatible with CG-5 Advanced Series mount
Celestron C11-A XLT Schmidt-Cassegrain OTA - 11" SCT Optical Tube Assembly Specifications...
Optical Design: Schmidt-Cassegrain
Aperture (mm): 279.4 mm (11 in)
Focal Length (mm): 2800 mm (110 in)
Focal Ratio: f/10
Eyepiece 1 (mm): 40 mm (1.57 in)
Magnification 1: 70 x
Star Diagonal: 1.25
Optical Tube: Aluminum
Highest Useful Magnification: 660 x
Lowest Useful Magnification: 40 x
Limiting Stellar Magnitude: 14.7
Resolution (Rayleigh): 0.5 arc seconds
Resolution (Dawes): 0.42 arc seconds
Light Gathering Power (Compared to human eye): 1593 x
Secondary Mirror Obstruction: 3.75 in (95 mm)
Secondary Mirror Obstruction by Diameter: 34 %
Secondary Mirror Obstruction by Area: 12 %
Optical Coatings: StarBright / XLT
Optical Tube Length: 24 in (610 mm)
Optical Tube Weight: 27.5 lbs (12 kg)
Dovetail Compatibility: CG-5 MountCelestron Product Number: 91067-XLT