Celestron 11" f/2,2 RASA Rowe-Ackermann Schmidt Astrograph (V2)

A high-speed telescope for astrophotography with 43.3 mm perfectly corrected and illuminated field!

♦ 279 mm (11 inch) aperture

♦ 620 mm focal length

♦ focal ratio 1:2,2

♦ 43.3 mm optimized image circle maintains pinpoint stars to the corners, 52 mm still very well usable

♦ Version 2 - new Ultra-Stable Focus System (USFS) minimizes focus shift (image shifts while focusing) and mirror flop (image shifts when telescope is moved)

♦ The new version 2 allows direct attachment of the CE821160 focusing motor without retrofit.

♦ quiet 12V MagLev fan reduces cooldown time and blocks dust

♦ common camera adapters (T-thread and M48) included

♦ 20 kg tube weight

♦ the tube is supplied with a second dovetail bar, so attaching accessories is easier.


 

Rowe-Ackermann Schmidt Astrograph - fast Deep Sky photo telescope

Engineered as a complete astroimaging system, every component of the Rowe-Ackermann Schmidt Astrograph 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 an optional imaging filter, every component of the system has been taken into careful consideration to work together seamlessly.

Most important features

♦ The 11" Rowe-Ackermann Schmidt Astrography by Celestron was built for speed! An ultra fast optical design features a focal ratio of just f/2.22.

♦ Rare-earth glass provides images with perfect color, free from coma and field curvature.

♦ 43.3 mm image circle optimized to keep tack sharp stars to the edges of even the largest imaging sensors. 52 mm are still well usable.

♦ New Ultra-Stable Focus System (USFS) minimizes focus shift and mirror flop

♦ A 12 V MagLev fan is super quiet. This high-output fan shortens cooldown time and blocks dust from the interior of your optical tube.

♦ Includes M48 and T-thread adapters for quick, easy attachment to popular CCD and DSLR cameras.

♦ Second dovetail bar for attaching accessories

 

More informations on the Rowe-Ackermann Schmidt Astrograph Design:

Capturing impressive deep-sky astroimages is easier than ever with Celestron’s new Rowe-Ackermann Schmidt Astrograph, the perfect companion to today’s top DSLR or astronomical CCD cameras. This fast, wide-field f/2.2 system offers two huge advantages over traditional f/10 astroimaging: better apparent tracking and shorter exposures. That means you’ll create better-looking astroimages in a fraction of the time, even without the use of an autoguider.

The Rowe-Ackermann Schmidt Astrograph builds on the legacy of Celestron’s Schmidt Camera, which allowed astrophotographers to produce images on film in the 1970s.

Today, with CCD sensor sizes as large as film - or larger - the Schmidt Astrograph offers a full 43.3 mm optimized image circle to capture pinpoint stars on the largest imaging chips. Optical performance for huge sensors with diagonals of up to 52 mm wide is still excellent.

Combine this large image circle with a focal length of just 620 mm 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 Rowe-Ackermann Schmidt Astrograph features newly designed 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 is 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 (#94155-A).

The integrated 12 V DC MagLev fan reduces cooldown time and provides optimal airflow through the dust filtered optical tube.

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 bar on the top of the optical tube provides a connection for use of optional accessories like a guidescope.

 

Optical Design:	Rowe-Ackermann Schmidt
Aperture:	279 mm (11 inch)
Focal Length:	620 mm
Focal Ratio:	1/2.2
Backfocus from front lens assembly:	69.26 mm
Backfocus from included camera adapters:	55 mm
Obstruktion:	114 mm
On-Axis RMS spot size:	<4 µm
Everywhere RMS spot size:	<4.5 µm
Design wavelength range:	400 to 700 nm
Light Gathering Power (Compared to human eye):	1588x
Optical Coatings:	StarBright XLT
Resolution (Rayleigh):	0.5 arc seconds
Resolution (Dawes):	0.41 arc seconds
Optical Tube Length:	840 mm (33 in)
Tube diameter:	315 mm (12.4 in)
Weight of the tube:	20 kg (43 lbs)
Max. camera weight:	10 kg (22 lbs)

In the box:
♦ Tube with Optics
♦ 2 dovetail bars (Losmandy style)
♦ T-Adapter (M42x0.75)
♦ M48 Camera Adapter