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Celestron S 203/400 RASA 800 CGEM II GoTo Specs
| Brand | Celestron |
| Full Model Code | Celestron RASA 8 CGEM II Computerized Telescope System |
| 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 |
| Optical Tube Dimensions | 235 mm x 628 mm |
| Optical Tube Weight | 7.70 kg (17.0 lbs) - Tube Only |
| Mount Attachment Type | CGEM II Motorized German Equatorial Mount with Dual-Saddle Plates and Internal Cable Routing |
| Finder Scope Specification | Not Included |
| Included Accessories | 42mm T-Thread Adapter, C-Thread Adapter, 12V DC Fan Battery Box, CGEM II Equatorial Mount Head, Heavy-Duty Steel Tripod (2-inch Legs), NexStar+ Hand Controller, 1x 7.7kg Counterweight, Car Battery Power Cord |
| Power Requirements | 12V DC, 3.2 Amps |
| Standard Warranty | 2-Year Limited Warranty |
| Application | Mid-tier automated sky sweeping and sensor tracking, mating a wide 3.2-degree capturing field to a tracking head to automate sky coordinate targets without camera field rotation. |
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