Celestron RASA 11 on CGX-L Equatorial Mount

Celestron RASA 11 on CGX-L Equatorial Mount

DESCRIPTION

The Celestron RASA 11 is a wide-field astrograph optimized for high-speed deep-sky imaging. It features a 620 mm focal length and a 43.3 mm optimized image circle, suitable for full-frame sensors. Its rare-earth 4-element optical group ensures perfect correction of coma, curvature, and chromatic aberration.

The Ultra-Stable Focus System with linear ball bearing suppresses image shift and mirror flop. A MagLev fan enhances cooldown with filtered airflow. The system includes M42 and M48 camera adapters and a multicoated optical window.

The CGX-L equatorial mount supports 75 lbs and features 144 mm worm wheels, dual dovetail saddles (CG-5/CGE), integrated PEC, and remote-friendly design. It supports CPWI, SkyPortal, ASCOM, and is ideal for observatories or mobile dark-sky imaging setups.

TECHNICAL SPECIFICATIONS

RASA 11 V2 Optical Tube

• Optical Design: Rowe-Ackermann Schmidt Astrograph

• Aperture: 279 mm

• Focal Length: 620 mm

• Focal Ratio: f/2.2

• Central Obstruction: 114 mm (41%)

• Optimized Image Circle: 43.3 mm (4.0°)

• Usable Field: 52 mm (4.8°)

• Rayleigh Resolution: 0.49 arcsec

• Dawes Resolution: 0.41 arcsec

• Spot Size RMS: < 4.4 μm

• Spectral Range: 400 – 700 nm

• Off-axis Transmission (21 mm): 83%

• Back Focus with Adapter: 55 mm

• Back Focus from Threaded Collar: 72.8 mm

• Optical Window: 68 mm fully multi-coated

• Focuser: Ultra-Stable Focus System

• Cooling: MagLev fan, 12V battery included

• Tube: Aluminum, Ø 330 mm, Length 838 mm

• Tube Weight: 19.5 kg (43 lbs)

• Dovetail: CGE (dual position)

CGX-L Mount

• Mount Type: Computerized Equatorial GoTo

• Payload Capacity: 75 lbs (34 kg)

• Worm Wheels: 144 mm

• Max Slew Speed: 3°/sec

• Tracking Rates: Sidereal, Solar, Lunar

• Alignments: 2-Star, 1-Star, Solar System, Quick Align

• PEC: Yes

• Ports: 4 AUX, 2 autoguide (1 near saddle), USB for mount and HC

• Power Input: 12 V / 3 A

• Tripod: 70 mm steel, height 838–1397 mm

• Total Height: 1524–1956 mm

• Mount Head: 23.8 kg (52.6 lbs)

• Tripod: 21 kg (46.2 lbs)

• Counterweights: 2 x 10 kg (22 lbs)

• Total Weight: 84.2 kg (185.8 lbs)

Included Items

• RASA 11 V2 Optical Tube

• CGX-L Equatorial Mount

• Steel Tripod

• 2 x 22 lb Counterweights

• NexStar+ Hand Control

• DC Power Cable

• Camera Adapters (M42 & M48)

• Counterweight Shaft

• Allen Key

• Software: CPWI, Starry Night SE, SkyPortal