CGX-L 1100 Rowe-Ackermann Schmidt Astrograph (RASA) Equatorial Telescope (12074) Celestron

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Description

The CGX-L 1100 Rowe-Ackermann Schmidt Astrograph Equatorial Telescope (CGX-L 11” RASA) sets a new standard in astroimaging systems at an extremely affordable price. The CGX-L 11” RASA telescope is an excellent advanced-level imaging setup. The Rowe-Ackermann Schmidt Astrograph (RASA) produces images in a fraction of the time compared to other optical tubes.  The CGX-L mount is designed to provide superior performance for larger telescopes while taking advantage of Celestron’s most advanced technologies: All-Star Polar Alignment, Celestron PWI telescope control software, Starry Night Special Edition software, SkyAlign, and permanently programmable periodic error correction (PPEC).

If you’re an experienced imager, you’ll love taking this mount to a dark sky site and enjoying all the conveniences of a larger observatory mount.

Rowe-Ackermann Schmidt Astrograph Features

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 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.

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 (#94155-A). The integrated 12V 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 bars on the top of the optical tube provides a connection for use of optional accessories like a guidescope.

CGX-L Mount Features:

Celestron’s CGX-L computerized equatorial mount is the pinnacle of our fully computerized equatorial mount series. Capable of carrying Celestron’s largest optical tubes with ease, CGX-L is perfect for backyard observatories and remote imagers looking for exceptional load capacity to weight ratio, compact design, and innovative features that fully support large telescopes, imaging kits, and the latest in wireless tech accessories.

Key design goals included:

• larger 144mm diameter worm wheels, which provide smoother operation and can more accurately drive heavier loads
• a longer 270mm dovetail saddle to support larger optical tubes
• remote operation-friendly features such as home and limit optical sensors
• easier polar alignment adjustments
• improved cable management

In addition to achieving all these goals, we’ve made mechanical and ergonomic improvements throughout CGX-L to make the mount sturdier, easier to use, and easier to transport.

Specifications

OPTICAL TUBE INFO:
Optical Design	Rowe-Ackermann Schmidt Astrograph
Aperture	279mm (11″)
Focal Length	620mm (24.4″)
Focal Ratio	f/2.2
Central obstruction diameter	114mm (4.48″) (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″) Ø , 4.0°
Useable field	52mm (2.04″) Ø , 4.8° only minimal performance loss at edge of FOV
Wavelength range	400 – 700 nm
Spot size	< 4.4 μm RMS across FOV
Optical Coatings	StarBright XLT
Off-axis Illumination	83% at 21mm (.82″) off-axis
Optical Window	68mm (2.67″) Ø
Back focus with included camera adapter	55mm (2.16″)
Back focus from top of threaded collar	72.8mm (2.86″)
Optical Tube	Aluminum
Optical Tube Length	838.2mm (33″)
Optical Tube Diameter	330.2mm (13″)
Focuser	Ultra-Stable Focus System
Finderscope	Not included
Optical Tube Weight	43 lbs (19.5 kg)
Other Features	Ventilation fan, dual dovetail mounting bars
Included items	42mm (1.65”) T-thread camera adapter | 48mm (1.89”) camera adapter | Dust cover | Fan battery pack
Dovetail	CGE Dovetail Bar
MOUNT INFO:
Mount Type	Computerized Equatorial
Instrument load capacity	75 lbs (34 kg)
Height adjustment range (includes mount and tripod)	908.05mm – 1339.85mm (35.75″ – 52.75″)
Tripod Leg Diameter	69.85mm (2.75″) Steel tripod
Latitude adjustment range	3° – 65°
Mount Head Weight	52.6 lbs (23.8 kg)
Accessory Tray	Yes
Tripod Weight	46.2 lbs (21 kg)
Weight of Counterweights	2 x 22 lbs
Slew Speeds	9 slew speeds – max speed 3°/second
Tracking Rates	Sidereal, Solar and Lunar
Tracking Modes	EQ North & EQ South
GPS	N/A
Dovetail Compatibility	Dual saddle plates (CG-5 and CGE saddle)
Number of Auxiliary ports	4 Aux ports (Hand Control can use any Aux port, 2 are located near the dovetail saddle for optional accessories)
Autoguide port	Yes, 2 ports (one is located near the dovetail saddle)
USB Port	Yes, input for Mount and Hand Control
Power Requirements	12V DC, 3 amps
Motor Drive	DC servo motors
Alignment Procedures	2-Star Align, 1-Star Align, Solar System Align, Last Alignment, Quick Align
Periodic Error Correction	Yes
Computer Hand Control	2 line x 18 character backlit Liquid Crystal Display, 19 LED backlit buttons, USB 2.0 port for PC connection
NexStar+ Database	40,000+ objects, 100 user defined programmable objects. Enhanced information on over 200 objects
Software	CPWI Telescope Control Software, Celestron Starry Night Special Edition Software, SkyPortal App
Total Kit Weight	185.8 lbs (84.2 kg)
Included Items	CGX-L Equatorial Head | CGX-L Tripod | Accessory Tray | 2 x 22 lb counterweight | NexStar+ Hand Control | DC Power Cable (item# 18769) | Counterweight Shaft | Hand Control Holster | 8mm Allen wrench (contained in rear carry handle)
California Residents	WARNING: Cancer and Reproductive Harm – .