Celestron 11-inch Rowe-Ackermann Schmidt Astrograph V2 OTA

Model #91076

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General Information

Optical design Rowe-Ackermann Schmidt Astrograph
Aperture 279mm (11-inch)
Focal length 620mm (24.4-inch)
Focal ratio f/2.2
Central obstruction diameter 114mm (4.48-inch) (41% of aperture diameter)
Light gathering power (Compared to human eye) 1588x
Resolution (Rayleigh) 0.49 arc seconds
Resolution (Dawes) 0.41 arc seconds
Image circle 43.3mm (1.7-inch) diameter, 4.0-degree
Useable field 52mm (2.04-inch) diameter , 4.8-degree only minimal performance loss at edge of FOV
Wavelength range 400 to 700 nm
Spot size < 4.4 micron RMS across FOV
Optical Coatings StarBright XLT
Off-axis Illumination 83% at 21mm (0.82-inch) off-axis
Optical Window 68mm (2.67-inch) diameter
Back focus with included camera adapter  55mm (2.16-inch)
Back focus from top of threaded collar 72.8mm (2.86-inch)
Optical tube Aluminum
Optical tube length   838.2mm (33-inch)
Optical tube diameter 330.2mm (13-inch)
Focuser Ultra-Stable Focus System
Finderscope Not included
Optical tube weight 43 lb (19.5 kg)
Other features Ventilation fan, dual dovetail mounting bars
Dovetail CGE Dovetail Bar
Product Description

Celestron 11-inch Rowe-Ackermann Schmidt Astrograph V2 OTA - 91076-CELESTRON

Capturing impressive deep-sky astroimages is easier than ever with Celestron’s Rowe-Ackermann Schmidt Astrograph (RASA) V2, the perfect companion to today’s top DSLR or astronomical CCD cameras. This fast, wide-field f/2.2 system allows for shorter exposure times compared to traditional f/10 astroimaging, without sacrificing resolution. Because shorter sub-exposure times are possible, your equatorial mount won’t need to accurately track over extended periods. The short focal length also lessens equatorial tracking demands. In many cases, autoguiding will not be required.

RASA 11 V2

RASA 11 V2 builds on the legacy of Celestron’s Schmidt Cameras, which allowed astrophotographers to produce images with much shorter exposure times on film in the 1970s. Today, with CCD sensor sizes as large as film or larger, the RASA 11 V2 offers a 43.3mm optimized image circle to capture pinpoint stars on the largest imaging chips. Optical performance for huge sensors with diagonals of up to 52mm wide is still excellent.

Wide-field Imaging

Combine this large image circle with a focal length of just 620mm and you have an instrument suitable for wide-field imaging, creating huge mosaics of the night sky, surveying, and even comet hunting.

Optical Performance

The RASA 11 V2 features optics with 4-element rare-earth glass for images free of false color and aberrations like coma and field curvature. The optical quality and spot size across the entire image circle are unprecedented for an astrograph in this price range or even that of a much more expensive instrument. The design also provides minimal vignetting.

Advanced Features

RASA 11 V2 utilizes the new Ultra-Stable Focus System (USFS). At the heart of this system is a precision linear ball bearing. The bearing serves to minimize focus shift (unwanted lateral motion of the primary mirror during focusing which causes shifting of the image) and mirror flop (movement of the primary mirror when the telescope is pointing to different positions in the sky). The USFS is also compatible with the optional Celestron Focus Motor. The integrated 12V DC MagLev fan reduces cooldown time and provides optimal airflow through the dust-filtered optical tube.

Complete Astroimaging System

Engineered as a complete astroimaging system, every component of the RASA 11 V2 is optimized for peak performance with DSLR and astronomical CCD cameras. Down to the thickness of the glass used in the included fully multicoated optical window or optional imaging filter, every component of the system has been taken into careful consideration to work together seamlessly. The Dovetail CGE bars on the top of the optical tube provide a connection for use of optional accessories like a guidescope.

Product Highlights
  • CGE Dovetail optical tube assembly
  • Fast, wide-field 11 inch f/2.2 optical design
  • USFS (Ultra Stable Focus System) equipped
  • Integrated air-cooling system with MagLev fans
  • Up to 52 mm usable field for large sensors
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