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GSO Dobson N 300/1500 DOB Telescope Specs
| Brand | GSO (Guan Sheng Optical) |
| Full Model Code | GSO 12-inch f/5 Classic Dobsonian Telescope (GS980) |
| Country of Origin | Taiwan |
| Optical Design | Newtonian Dobsonian (Parabolic Primary Mirror) |
| Aperture | 300 mm (11.81 inches) |
| Focal Length | 1500 mm |
| Focal Ratio | f/5 |
| Optical Coatings | High-Reflectivity Aluminum Coating with Silicon Dioxide Protective Layer (93% Reflectivity) |
| Glass Material | Premium Parabolic BK7 Structural Core Glass |
| Secondary Mirror Obstruction | 70 mm |
| Secondary Mirror Obstruction by Diameter | 23.3% |
| Secondary Mirror Obstruction by Area | 5.4% |
| Resolving Power | 0.39 Arcseconds (Dawes), 0.46 Arcseconds (Rayleigh) |
| Limiting Visual Magnitude | 14.5 |
| Highest Useful Magnification | 600x |
| Lowest Useful Magnification | 43x |
| 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 (Standard Primary Collimation Springs with Manual Lock Screws) |
| Optical Tube Dimensions | 356 mm x 1450 mm |
| Optical Tube Weight | 18.40 kg (40.56 lbs) |
| Mount Attachment Type | Wooden Ground Rocker Box with Side Spring-Tension Friction Adjustment Pegs |
| Finder Scope Specification | 8x50 Achromatic Optical Finder Scope with Crosshair Bracket |
| Included Accessories | 2.0-inch Crayford Focuser, Plossl 25mm Eyepiece (1.25-inch / 60x), Side Tension Spring Elements, Eyepiece Deck Module, Assembly Hardware |
| Standard Warranty | 2-Year Limited Warranty |
| Application | Intermediate visual deep-sky exploration and lunar topography sweeps, deploying a clean parabolic primary assembly to gather substantial photons without chromatic dispersion anomalies. |
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