Used - 11" Rowe-Ackermann Schmidt Astrograph (RASA 11) V2 Optical Tube Assembly (CGE Dovetail)
Item #: U91076 / 91076-CGLPlease note: This is a gently used item. For complete product details, specs, and extras, please visit the original product page.
Gently Used, Fully Trusted
At Celestron, we believe the cosmos should be within everyone’s reach. That’s why our gently used items have been rigorously inspected and are in full working order—even if they show a few signs of past adventures. When you purchase this product, you’ll also enjoy the same comprehensive warranty as our new items, giving you confidence and peace of mind as explore the night sky.
Clear skies and happy stargazing!
Overview
Please note: This is a gently used item. For complete product details, specs, and extras, please visit the original product page.
Gently Used, Fully Trusted
At Celestron, we believe the cosmos should be within everyone’s reach. That’s why our gently used items have been rigorously inspected and are in full working order—even if they show a few signs of past adventures. When you purchase this product, you’ll also enjoy the same comprehensive warranty as our new items, giving you confidence and peace of mind as explore the night sky.
Clear skies and happy stargazing!
Includes These Celestron Technologies
Customers Also Purchased
Description
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 (0.82") 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 |
Videos
Accessories
FAQ
What is the heaviest recommend load for mounting a camera onto the RASA 11?
We recommend a load of no more than 33 lbs. at 5.0 inches away from the 11" Schmidt corrector.
I have a RASA 11, and I’m not certain if it is the original version or the V2 version. How can I tell the difference?
The RASA 11 V2 uses the Ultra-Stable Focus System, and therefore does not have mirror clutch knobs on the rear cell. The RASA 11 V2 also comes with the Celestron focus knob, not the FeatherTouch MircoFocuser.
Support & Downloads
| Manuals: |
|---|
| RASA 11" V2 Manual |
| Whitepaper RASA |
| Software & Firmware: |
| Periodic Error Correction Tool (PECTool) |
| Drawings: |
| RASA 11" Optical Tube Assembly Dimensional Drawings |
| Other Product Files: |
| Camera Adapter requirements |
| How to Align a Red Dot Finder to Your Telescope Video |
| Solar Safety Warning |
