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Description
Celestron 91076 Overview
- 1Description
- 2Optical Performance
- 3StarBright XLT Coating System
- 4Ultra-Stable Focus System
- 5Mounting
This updated second-generation Celestron 11" f/2.2 Rowe-Ackermann Schmidt Astrograph v.2 builds on the success and performance of its earlier iteration with the addition of an improved Ultra-Stable Focus System that minimizes both focus shift and mirror flop to improve image quality.
The RASA system 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 CGE-style dovetail plate for use on mounts that accept the larger Losmandy-size mounting system.
Using 4-element rare-earth optical glass lenses ensures accurate color rendition and eliminates aberrations such as coma and field curvatures. The 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 12VDC 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 and background noise without sacrificing image quality and gives you more time for multiple shots of the same object with different filters for later post processing and stacking. 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 separately if required.
- 11" diameter wide-field aperture enables detailed images to be captured of even the faintest deep-sky objects like wispy nebulae
- 620mm focal length is optimized for wide-field imaging, creating huge mosaics of the night sky, surveying, and comet hunting
- Fast f/2.2 focal ratio requires significantly shorter exposures versus slower f/10 OTAs with reduced background noise�this allows more images to be captured, especially with different filters, for post-processing and stacking
- Rowe-Ackermann Schmidt Astrograph (RASA) design is purpose built for astrophotography and imaging performance and cannot be used for visual observation
- Proprietary StarBright XLT fully multi-coated optical system
- Four-element rare-earth glass for true color rendition without aberrations like off-axis coma and field curvature across the entire field of view
- 42mm T-thread and M48 camera adapters included for attachment to CCD and DSLR cameras
- Wide 400-700nm spectral range improves images of deep-space objects like galaxies and nebulae
- Internal Ultra-Stable Focus System
- Image circle: 43.3mm (1.7")
- Resolution: 0.49 arcsec (Rayleigh), 0.41 arcsec (Dawes)
- Back focus: 55mm (2.16") with included camera adapter, 72.8mm (2.86") from top of threaded collar
- Optical window can be removed and replaced with optional filters such as a light pollution filter
- 12 VDC MagLev fan reduces cooldown time, provides airflow, and filters dust�runs on eight user-supplied AA batteries or an optional 12VDC power adapter
- 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
- Utilizes a linear ball bearing that moves the primary mirror to achieve focus
- Minimizes focus shift�unwanted lateral motion of the primary mirror during focusing that causes shifting of the image
- Minimizes mirror flop�movement of the primary mirror when the telescope is pointing to different positions in the sky
- Compatible with an optional focus motor for even more precise focus control
- OTA only�mount and tripod required for proper use
- Large CGE (Losmandy) dovetail plate makes it compatible with a wide variety of heavy-duty mount heads
- OTA weight: 43 pounds; ensure mount and tripod can support this weight plus any additional gear like imaging systems and guide scopes
In the Box
- Celestron 11" f/2.2 Rowe-Ackermann Schmidt Astrograph v.2 (OTA only)
- 42mm T-Adapter
- 48mm Camera Adapter
- Fan Motor Battery Holder
- Dust Cover
- Limited 2-Year Warranty
- Description
- Optical Performance
- StarBright XLT Coating System
- Ultra-Stable Focus System
- Mounting
Celestron 91076 Specs
| Optical Design | RASA |
| Aperture | 280 mm / 11" |
| Focal Length | 620 mm |
| Focal Ratio | f/2.2 |
| Resolution | 0.49 Arcsec (Rayleigh) 0.41 Arcsec (Dawes) |
| Focuser | Internal |
| Diagonal | None |
| Finderscope | None |
| Mounting | Losmandy Style |
| Optical Tube Dimensions | 33 x 13" / 83.8 x 33 cm |
| Batteries | 8 x AA |
| GPS | No |
| Wi-Fi | No |
| Weight | 43 lb / 19.5 kg |
| Package Weight | 57 lb |
| Box Dimensions (LxWxH) | 38.6 x 19.4 x 19.2" |
Celestron 91076 Reviews
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Bulk Discount
| Quantity | Price |
| 2 | ₹ 759034.5 |
| 3-5 | ₹ 751289.25 |
| 5-10 | ₹ 735798.75 |
| 10+ | ₹ 720308.25 |
Bulk discount will be automatically applied during checkout based on quantity.