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GSO Dobson N 250/1250 DOB Telescope
Built around a 250mm parabolic mirror, the GSO Dobson N 250/1250 DOB Telescope provides a 1250mm focal length, 2-inch focuser, and heavy-duty wooden rocker box.
- 250mm aperture provides 0.46-arcsecond resolution
- 1250mm focal length uses f/5 optics
- 8×50 finder and tension springs included
- 25mm eyepiece provides listed 50x magnification
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Description
Wide-aperture deep-sky observation is the focus of the GSO Dobson N 250/1250 DOB Telescope, a 10-inch parabolic Newtonian reflector with a 1250 mm focal length and listed f/5 optical ratio. Its wooden rocker box, powder-coated steel tube, 2-inch Crayford focuser, 8×50 finder, 25 mm Plossl eyepiece, tension hardware, accessory board, protective front cap, and high-reflectivity mirror coating provide a practical manual platform for galaxies, nebulae, clusters, planets, and lunar features.
The low-expansion parabolic glass primary mirror is protected by an aluminum and silicon dioxide coating, while the manual Dobsonian base provides direct altitude and azimuth movement without battery power or computerized alignment. The rear cooling-fan mount configuration identified in the supplied data can support preparation before observation, while collimation, balance, dust protection, and careful storage remain important for consistent use.
Key Features of GSO Dobson N 250/1250 DOB Telescope
This 10-inch Dobsonian combines a 250 mm parabolic Newtonian mirror with a 1250 mm focal length, f/5 optical ratio, enhanced reflective coating, wooden rocker box, 2-inch Crayford focuser, 8×50 finder, tension hardware, accessory board, and supplied dust protection.
- 250 mm parabolic Newtonian reflector
- 1250 mm focal length with listed f/5 optical ratio
- Manual wooden Dobsonian rocker box
- High-reflectivity aluminum and SiO2 coating
- 2-inch Crayford focuser with reducer
- 8×50 achromatic finder with quick-release bracket
- 25 mm Plossl eyepiece
- Tension springs, accessory board, cooling-fan mount, and dust cap
Manual Galaxy and Cluster Observation
The supplied application focuses on galaxies, nebulae, star clusters, lunar features, and planetary targets, with the 250 mm aperture supporting the listed deep-sky role while the 1250 mm focal length offers a balanced visual format and the rocker box enables direct target movement without electronic tracking hardware.
Why Choose GSO Dobson N 250/1250 DOB Telescope
The 10-inch GSO Dobsonian is relevant when a visual setup needs more aperture than a 6- or 8-inch telescope while retaining simple manual operation, a parabolic mirror, Crayford focusing, large optical finding, tension adjustment, accessory storage, and a floor-based rocker system that works without batteries or GoTo alignment.
- 250 mm aperture for expanded deep-sky observation
- Manual rocker-box operation without electronic tracking
- Crayford focuser, finder, eyepiece, tension hardware, and accessory board included
GSO 2-Year Limited Warranty
The supplied product information lists a 2-year limited warranty for this telescope, and the applicable regional warranty terms, optical coverage, focuser coverage, cooling-fan coverage, rocker-box coverage, registration requirements, and authorized service process should be confirmed before purchase because GSO product support varies by distributor and market.
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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