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GSO Dobson N 300/1500 DOB Telescope
Designed for manual deep-sky observation, the GSO Dobson N 300/1500 DOB Telescope combines a 300mm parabolic mirror with 1500mm focal length and a classic wooden rocker box.
- 300mm aperture provides 0.39-arcsecond resolution
- 1500mm focal length uses f/5 optics
- 25mm eyepiece provides listed 60x magnification
- 8×50 finder and accessory hardware included
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Description
Manual deep-sky observation with a substantial optical tube defines the GSO Dobson N 300/1500 DOB Telescope, a 12-inch parabolic Newtonian reflector with a 1500 mm focal length and listed f/5 optical ratio. Its powder-coated steel tube is paired with a wooden rocker box, 2-inch single-speed Crayford focuser, 8×50 finder, 25 mm Plossl eyepiece, side-tension springs, accessory deck, and assembly hardware for a straightforward visual astronomy configuration.
The BK7 parabolic primary uses high-reflectivity aluminum with silicon dioxide protective coating, while the manual Dobsonian base provides direct altitude and azimuth movement without electronic alignment or motorized tracking. The supplied configuration is intended for galaxies, nebulae, clusters, lunar features, and planetary observation, with collimation, balance, dust protection, and careful storage supporting routine operation.
Key Features of GSO Dobson N 300/1500 DOB Telescope
This classic 12-inch Dobsonian combines a 300 mm parabolic Newtonian mirror with a 1500 mm focal length, f/5 optical ratio, high-reflectivity coating, wooden rocker box, 2-inch Crayford focuser, 8×50 finder, 25 mm eyepiece, tension hardware, accessory deck, and assembly components.
- 300 mm parabolic Newtonian reflector
- 1500 mm focal length with listed f/5 optical ratio
- Manual wooden Dobsonian rocker box
- High-reflectivity aluminum and SiO2 coating
- 2-inch single-speed Crayford focuser
- 8×50 achromatic finder with crosshair
- 25 mm Plossl eyepiece
- Side-tension springs and accessory deck
Manual Large-Aperture Observation
The supplied application focuses on galaxies, nebulae, star clusters, lunar topography, and planetary viewing, with the 300 mm aperture providing the listed large-aperture visual format while the 1500 mm focal length supports direct manual observation through the rocker box and routine target movement across the sky.
Why Choose GSO Dobson N 300/1500 DOB Telescope
The classic 12-inch GSO configuration is relevant when the main priority is substantial visual aperture with simple manual control, a parabolic mirror, 2-inch focusing, a large optical finder, tension adjustment, and a wooden rocker base that avoids batteries, computerized setup, and motorized tracking.
- 300 mm aperture for the listed deep-sky application
- Manual rocker-box operation without electronic tracking
- Crayford focuser, finder, eyepiece, tension elements, and accessory deck 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, mirror coverage, focuser coverage, rocker-box coverage, accessory coverage, registration requirements, and authorized service process should be confirmed before purchase because GSO product support varies by distributor and market.
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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