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Celestron S 279/620 RASA 1100 V2 Astrograph OTA Specs
| Brand | Celestron |
| Full Model Code | Celestron Rowe-Ackermann Schmidt Astrograph 11 V2 (91076) |
| Country of Origin | United States / China |
| Optical Design | Rowe-Ackermann Schmidt Astrograph (4-Element Rare-Earth Lens Group with Spherical Primary Mirror) |
| Aperture | 279 mm (11.0 inches) |
| Focal Length | 620 mm |
| Focal Ratio | f/2.2 |
| Optical Coatings | StarBright XLT Reflective and Anti-Reflective Multi-Coatings with Broadband AR Lens Coatings |
| Central Obstruction Diameter | 114 mm |
| Central Obstruction by Diameter | 41% |
| Central Obstruction by Area | 17% |
| Resolving Power | 0.41 Arcseconds (Dawes), 0.49 Arcseconds (Rayleigh) |
| Limiting Visual Magnitude | Not Applicable (Pure Imaging Instrument) |
| Highest Useful Magnification | Not Applicable (No Visual Eyepiece Support) |
| Lowest Useful Magnification | Not Applicable (No Visual Eyepiece Support) |
| Optical Tube Material | Aluminum |
| Focuser Style & Mechanism | Ultra-Stable Focus System (USFS) with Precision Linear Ball Bearings Counteracting Focus Shift |
| Mirror Lock Mechanism | No (Stabilized via Internal USFS Bearing Mechanism) |
| Optical Tube Dimensions | 330.2 mm x 838.2 mm |
| Optical Tube Weight | 19.50 kg (43.0 lbs) - Tube Only |
| Mount Attachment Type | Dual Top and Bottom CGE Full-Length Losmandy-Style Dovetail Bars |
| Finder Scope Specification | Not Included |
| Included Accessories | 42mm T-Thread Camera Adapter, 48mm Wide Camera Adapter, Protective Dust Cover, 12V DC MagLev Cooling Fan Assembly with Battery Pack |
| Standard Warranty | 2-Year Limited Warranty |
| Application | Full-frame large sensor deep space astrophotography, projecting a flat 43.3mm image circle free of field curvature across large-format camera blocks to capture deep nebulae and galaxies. |
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