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User Manual for Celestron 11" f 2.2 Rowe-Ackermann Schmidt Astrograph Click to enlarge the picture
Contents of the user manual for the Celestron 11" f 2.2 Rowe-Ackermann Schmidt
- Product category: Catadioptrics (Cassegrains) Celestron
- Brand: Celestron
- Description and content of package
- Technical information and basic settings
- Frequently asked questions – FAQ
- Troubleshooting (does not switch on, does not respond, error message, what do I do if...)
- Authorized service for Celestron Catadioptrics (Cassegrains)
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User manual for the Celestron 11" f 2.2 Rowe-Ackermann Schmidt contain basic instructions
that need to be followed during installation and operation.
Before starting your appliance, the user manual should be read through carefully.
Follow all the safety instructions and warnings, and be guided by the given recommendations.
User manual is an integral part of any Celestron product,
and if it is sold or transferred, they should be handed over jointly with the product.
Following the instructions for use is an essential prerequisite for protecting
health and property during use, as well as recognition of liability on the part of the manufacturer
for possible defects should you make a warranty claim. Download an official Celestron user manual in which you will find instructions on how to install, use, maintain and service your product.
And do not forget – unsuitable use of a Celestron product will considerably shorten its lifespan!
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Product description - Rowe-Ackermann Schmidt Astrograph Tour
The 11" f/2.2 Rowe-Ackermann Schmidt Astrograph from Celestron is specifically designed for astrophotography and astroimaging with a large 11" aperture and fast f/2.2 focal ratio. The optical tube assembly (OTA) is being offered by itself without a mount and comes with a Celestron CGEM-style dovetail plate for use on compatible mounts and tripods. Using 4-element rare-earth optical glass lenses ensures accurate color rendition and eliminates aberrations such as coma and field curvatures. The improved StarBright XLT multi-coating system, which includes anti-reflection coatings on the lenses and highly reflective coatings on the mirrors, increases light transmission throughout the entire optical path. A 12V MagLev fan reduces cooldown time and provides optimal airflow through the optical tube while filtering harmful dust from the interior.The 43.3mm imaging circle is made to cover today's large DSLR and CCD imaging sensors to capture full-frame shots without vignetting, while a fast focal ratio reduces exposure times without sacrificing image quality and gives the user more time for multiple shots of the same object for layering or with different filters. A custom-designed FeatherTouch micro focus system has a 10:1 reducer with linear brass focuser bearing to enable very precise focusing to clearly resolve topographic details on the Moon or split double stars and reveal details of most other celestial objects in between. Since this OTA is designed as an imaging scope, a 42mm T-thread camera adapter and 48mm camera adapter are provided. Other adapters are available if required. - Optical Performance
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- 11"-diameter aperture
- 620mm focal length
- Fast f/2.2 focal ratio
- Proprietary StarBright XLT fully multi-coated optical system
- 4-element rare-earth glass for true color rendition without aberrations across the entire field of view
- 43.3mm image circle captures pinpoint stars on today's large CCD and DSLR imaging chips
- Resolution: 0.5 arcsec (Rayleigh), 0.41 arcsec (Dawes)
- StarBright XLT Coating System
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- Multi-layer mirror coatings made from layers of aluminum, SiO2 (silicon dioxide), and TiO2 (titanium dioxide)
- Reflectivity is flat across the light spectrum, for both astrophotography/astroimaging and visual observation
- Multi-layer anti-reflective coatings made from layers of MgF2 (magnesium fluoride) and HfO2 (hafnium dioxide)
- High-transmission water white glass corrector lens with 97.4% light transmission
- Focuser
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- Linear brass focuser bearing reduces image shift
- Dual-speed 10:1 FeatherTouch micro focus knob provides precise focusing
- Construction Details
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- 42mm T-thread and M48 camera adapters included for attachment to CCD and DSLR cameras
- Heavy duty CGEM dovetail plate
- 12 VDC MagLev fan reduces cooldown time, provides airflow, and filters dust
UPC: 050234910750 In the Box Celestron 11" f/2.2 Rowe-Ackermann Schmidt Astrograph (OTA only) 42mm T-Adapter 48mm Camera Adapter Limited 2-Year Warranty Table of Contents
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Technical parametersCelestron Rowe-Ackermann Specs | | | Optical Design | RASA | | Aperture | 280 mm / 11" | | Focal Length | 620 mm | | Focal Ratio | f/2.2 | | Diagonal | None | | Finderscope | No | | Mounting System | Losmandy Style | | Optical Tube Dimensions | Length: 33" / 83.8 cm | | | | Adapter | 12 VDC | | Weight | 43.0 lb / 19.5 kg | | | | Package Weight | 57.0 lb | | Box Dimensions (LxWxH) | 39.0 x 20.0 x 19.0" |
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