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GSO Dobson N 250/1250 DOB Telescope Specs
| Brand | GSO (Guan Sheng Optical) |
| Full Model Code | GSO 10-inch f/5 Classic Dobsonian Telescope (GS880) |
| Country of Origin | Taiwan |
| Optical Design | Newtonian Dobsonian (Parabolic Primary Mirror) |
| Aperture | 250 mm (9.84 inches) |
| Focal Length | 1250 mm |
| Focal Ratio | f/5 |
| Optical Coatings | High-Reflectivity Aluminum Coating with Silicon Dioxide Protective Layer (93% Reflectivity) |
| Glass Material | Premium Selection Low-Expansion Parabolic Glass Base Element |
| Secondary Mirror Obstruction | 63 mm |
| Secondary Mirror Obstruction by Diameter | 25.2% |
| Secondary Mirror Obstruction by Area | 6.35% |
| Resolving Power | 0.46 Arcseconds (Dawes), 0.55 Arcseconds (Rayleigh) |
| Limiting Visual Magnitude | 14.1 |
| Highest Useful Magnification | 500x |
| Lowest Useful Magnification | 36x |
| Optical Tube Material | Powder-Coated Rolled Steel Cylinder Structure |
| Focuser Style & Mechanism | 2.0-inch Single-Speed Crayford Focuser with 1.25-inch Step-Down Reducer |
| Mirror Lock Mechanism | No (Equipped with Rear Cooling Fan Mount Configuration) |
| Optical Tube Dimensions | 303 mm x 1210 mm |
| Optical Tube Weight | 12.20 kg (26.9 lbs) |
| Mount Attachment Type | Wooden Ground Rocker Box with Heavy-Duty Side Bearing Trunnions and Tension Spring Hardware |
| Finder Scope Specification | 8x50 Achromatic Optical Finder Scope with Quick-Release Bracket |
| Included Accessories | 2.0-inch Crayford Focuser, Plossl 25mm Eyepiece (1.25-inch / 50x), Tension Springs Assembly Kit, Multislot Accessory Board, Protective Front Dust Cap |
| Standard Warranty | 2-Year Limited Warranty |
| Application | High-aperture visual galaxy surveying and complex star cluster grouping, capturing weak starlight metrics within a wide 10-inch light-gathering barrier safely. |
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