Celestron 11" RASA Rowe-Ackermann Schmidt Astrograph Telescope OTA

Celestron 11" f/2.2 Rowe-Ackermann Schmidt Astrograph OTA v.2

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Your Price: CAD6,779.27

Retail Price:CAD7,118.23

Your Savings:CAD338.96(5%)

Celestron 11" f/2.2 Rowe-Ackermann Schmidt Astrograph OTA

Part Number: 91076

Availability: Usually ships in 5-7 business days

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Description

Product Highlights

Large 11"-Diameter Aperture
620mm Focal Length/ f/2.2 Focal Ratio
StarBright XLT Optical Coating System
4-Element Rare-Earth Optical Glass

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.

Optical Performance

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

StarBright XLT Coating System

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

Ultra-Stable Focus System

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

Mounting

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

Specifications

Optical Tube Assembly

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 System	Losmandy Style
Optical Tube Dimensions	33 x 13" / 83.8 x 33 cm

General

Batteries	8 x AA
GPS	No
Wi-Fi	No
Weight	43.0 lb / 19.5 kg

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

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Celestron 11" f/2.2 Rowe-Ackermann Schmidt Astrograph OTA v.2

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