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Bresser N 203/800 Messier NT 203S EXOS-2 Specs
| Brand | Bresser |
| Full Model Code | Bresser Messier NT-203S/800 EXOS-2 |
| Country of Origin | Germany |
| Optical Design | Newtonian Reflector (Fast Photo-Visual Format) |
| Aperture | 203 mm (8.0 inches) |
| Focal Length | 800 mm |
| Focal Ratio | f/3.9 |
| Optical Coatings | High-Reflective Aluminum Coating with Quartz Protective Layer |
| Secondary Mirror Obstruction | 70 mm |
| Secondary Mirror Obstruction by Area | 11.9% |
| Backfocus Distance | 85 mm |
| Resolving Power | 0.57 Arcseconds |
| Limiting Visual Magnitude | 13.5 |
| Highest Useful Magnification | 400x |
| Lowest Useful Magnification | 29x |
| Optical Tube Material | Steel |
| Focuser Style & Mechanism | 2.5-inch Hexafoc Heavy-Duty Rack and Pinion Focuser (Dual-Speed 10:1 reduction optimized) |
| Mirror Lock Mechanism | No |
| Optical Tube Dimensions | 250 mm x 740 mm |
| Optical Tube Weight | 11.5 kg (25.35 lbs) - Tube Only |
| Mount Attachment Type | EXOS-2 High-Load German Equatorial Mount with Integrated Polar Scope |
| Finder Scope Specification | 8x50 Optical Finder Scope |
| Included Accessories | 26mm Super Plossl Eyepiece (31x), 1.25-inch Eyepiece Adapter, EXOS-2 Equatorial Mount, Heavy-Duty Stainless Steel Field Tripod, Counterweights (2x 4.5kg), Tube Rings with Vixen-Style Dovetail Plate |
| Standard Warranty | 2-Year Factory Warranty |
| Application | Manual steady right-ascension tracking for deep-sky surveying, leveraging an ultra-fast f/3.9 parabolic system tailored for brilliant low-magnification wide-field exploration and swift optical deployment. |
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