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Celestron S 203/400 RASA 800 Astrograph OTA Specs
| Brand | Celestron |
| Full Model Code | Celestron Rowe-Ackermann Schmidt Astrograph 8 (91073) |
| Country of Origin | United States / China |
| Optical Design | Rowe-Ackermann Schmidt Astrograph (4-Element Rare-Earth Lens Group with Spherical Primary Mirror) |
| Aperture | 203 mm (8.0 inches) |
| Focal Length | 400 mm |
| Focal Ratio | f/2.0 |
| Optical Coatings | StarBright XLT Reflective and Anti-Reflective Multi-Coatings with Broadband AR Lens Coatings |
| Central Obstruction Diameter | 93 mm |
| Central Obstruction by Diameter | 46% |
| Central Obstruction by Area | 21% |
| Resolving Power | 0.57 Arcseconds (Dawes), 0.68 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 | 235 mm x 628 mm |
| Optical Tube Weight | 7.70 kg (17.0 lbs) - Tube Only |
| Mount Attachment Type | Integrated Full-Length CGE Vixen-Losmandy Compatible Dovetail Bar |
| Finder Scope Specification | Not Included (Features M4 Accessory Mounting Threads) |
| Included Accessories | 42mm T-Thread Camera Adapter, C-Thread Camera Adapter, 12V DC Cooling Fan Battery Pack Assembly |
| Standard Warranty | 2-Year Limited Warranty |
| Application | Ultra-fast wide-field deep sky astro-imaging, positioning high-sensitivity electronic sensors at the prime focus window to record expansive nebulae structures inside brief exposure frames. |
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