Celestron 14" f/2.2 Rowe-Ackermann Schmidt Astrograph (OTA Only)

BH #CE14RASAOTA • MFR #91077
Celestron 14" f/2.2 Rowe-Ackermann Schmidt Astrograph (OTA Only)
Key Features
  • Patented Catadioptric Astrograph Design
  • 790mm Focal Length/ f/2.2 Focal Ratio
  • StarBright XLT Optical Coating System
  • 4-Element Rare-Earth Optical Glass
Representing the largest aperture in the RASA series, the Celestron 14" f/2.2 Rowe-Ackermann Schmidt Astrograph (RASA) is designed for photographing and imaging all kinds of celestial objects—even the dimmest galaxies and whispiest nebulae. The use of four-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. An integrated fan reduces cooldown time and provides optimal airflow through the optical tube assembly (OTA) while filtering harmful dust from the interior.
Special Order
Expected availability: 7-14 business days
$13,999.00

Important Notice

  • This item is noncancelable and nonreturnable.

Celestron 14" f/2.2 Rowe-Ackermann Schmidt Astrograph (OTA Only)

Sales and export of this item to South Korea are prohibited.

Jacob K., B&H Optics Expert

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Celestron Rowe-Ackermann Overview

  • 1Description
  • 2Optical Performance
  • 3StarBright XLT Coating System
  • 4Focuser
  • 5Mounting
  • 6Included Accessories

Representing the largest aperture in the RASA series, the Celestron 14" f/2.2 Rowe-Ackermann Schmidt Astrograph (RASA) is designed for photographing and imaging all kinds of celestial objects—even the dimmest galaxies and whispiest nebulae. The use of four-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. An integrated fan reduces cooldown time and provides optimal airflow through the optical tube assembly (OTA) while filtering harmful dust from the interior.

The astrograph design is defined by its fast focal ratio, which reduces exposure times without sacrificing image quality and gives you more time for multiple shots of the same object for layering or with different filters. Its internal Ultra-Stable focusing mechanism enables 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, while minimizing unwanted lateral movement of the primary mirror when focusing or slewing. Since this OTA is designed as an imaging scope, it has a massive 60.1mm (2.36") imaging circle that will cover large imaging sensors such as those on medium-format cameras, and a large 48mm camera T-adapter is included for easy camera mounting.

Optical Performance

  • Large 355.6mm (14") diameter aperture allows users to image dim deep-space objects
  • 790mm focal length helps to produce a fast focal ratio
  • Fast f/2.2 focal ratio requires significantly lower exposure times versus slower ratios to produce the same results
  • Rowe-Ackermann Schmidt astrograph (RASA) design is purpose built for astrophotography and imaging performance, and is not recommended for visual use
  • Proprietary StarBright XLT fully multi-coated optical system
  • Four-element rare-earth glass for true color rendition without aberrations across the entire field of view
  • Wide 400-900nm spectral range improves images of deep space objects like galaxies and nebulae
  • Extremely wide 60.1mm (2.36") imaging circle will completely cover today's larger camera sensors for full-frame images without vignetting
  • Resolution: 0.39 arcsec (Rayleigh), 0.36 arcsec (Dawes)
  • Back focus: 55mm (2.16") with included camera adapter, 77.5mm (3.05") from top of threaded collar
  • Optical window can be removed and replaced with optional filters such as a light pollution filter
  • Integrated cooling fan brings optical system to ambient air temperature for better performance
  • Runs on eight user-supplied AA batteries or 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/astro-imaging
  • 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

  • Focusing system moves primary mirror forward and back to achieve tack-sharp images
  • Ultra-stable design minimizes unwanted lateral movement of the primary mirror when focusing or slewing
  • Fine adjustments for precise focusing, approximately 30 turns of the knob runs through the focus range

Mounting

  • OTA only, mount and tripod required for proper use
  • Includes large CGE/Losmandy-D dovetail plate for use on larger more stable mount heads
  • Secondary CGE/Losmandy-D dovetail plate located on top of OTA for easy mounting of accessories like guidescopes and imaging gear
  • Weight: 75 pounds

Included Accessories

  • Large 48mm (1.89") T-adapter included for larger format cameras
  • Battery pack takes eight user-supplied AA batteries to power the integrated cooling fan
UPC: 050234910774

Celestron Rowe-Ackermann Specs

Optical DesignRowe-Ackermann Schmidt
Aperture14.0" / 355.6mm
Focal Length790mm
Focal Ratiof/2.2
Back FocusWith included camera adapter: 2.16" / 55.0mm
From top of threaded collar: 3.05" / 77.5mm
Eyepiece Barrel DiameterN/A
DiagonalNone
FinderscopeNone
TripodNone
Mount TypeLosmandy-D/CGE dovetail plate
Power Requirement8 x AA batteries
12VDC, 100mA power adapter
DimensionsLength: 42.5" / 1079.5mm
Diameter: 16.0" / 106.4mm
Weight75.0.0 lb / 34.0 kg
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