Celestron Cometron FirstScope N 76/300 DOB
Designed for tabletop observation, the Celestron Cometron FirstScope N 76/300 DOB combines a 76mm spherical Newtonian reflector with 300mm focal length and a manual Dobsonian rocker box.
- 76mm aperture provides 1.53-arcsecond resolution
- 300mm focal length uses f/3.95 optics
- Tabletop Dobsonian mount and eyepieces included
- 5×24 finder and astronomy software included
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Description
Wide-field comet and deep-sky observation are the central strengths of the Celestron Cometron FirstScope N 76/300 DOB, a compact Newtonian reflector with a 76 mm aperture, 300 mm focal length, and listed f/3.95 optical ratio. Its spherical primary mirror sits in a manual tabletop Dobsonian-style rocker box, while the 5×24 finder and 20 mm and 10 mm Kellner eyepieces provide the essential components for simple manual celestial observation.
The plastic optical tube uses an aluminum-coated spherical mirror with silicon dioxide protective overcoating and a 1.25-inch rack-and-pinion focuser, while the tabletop configuration avoids the need for a separate tripod or equatorial mount. The fast optical format supports broad views of comets, star clusters, galaxies, nebulae, and the Moon, and the lightweight design is suited to easy movement between suitable observing locations.
Key Features of Celestron Cometron FirstScope N 76/300 DOB
This compact tabletop reflector combines a 76 mm spherical Newtonian mirror with a 300 mm focal length, fast f/3.95 optical ratio, manual Dobsonian-style rocker box, plastic optical tube, 5×24 finder, two Kellner eyepieces, and a 1.25-inch focuser for straightforward wide-field observation.
- 76 mm Newtonian reflector with spherical primary mirror
- 300 mm focal length with listed f/3.95 optical ratio
- Manual tabletop Dobsonian rocker box
- Aluminum coating with SiO2 protective overcoating
- 1.25-inch rack-and-pinion focuser
- 20 mm and 10 mm Kellner eyepieces
- 5×24 optical finder scope
- Lightweight plastic optical tube
Portable Wide-Field Observation
The supplied application focuses on manual tabletop observation of comets, star clusters, galaxies, nebulae, lunar features, and other broad-field celestial targets, with the fast 300 mm optical format supporting wide framing while the Dobsonian-style rocker box allows direct movement without a separate tripod or complex alignment routine.
Why Choose Celestron Cometron FirstScope N 76/300 DOB
This model is a suitable choice when a buyer wants a compact tabletop telescope with a fast wide-field optical format, simple rocker-box control, lightweight construction, two Kellner eyepieces, and a 5×24 finder for introductory observation of comets, star clusters, galaxies, nebulae, and the Moon.
- Fast f/3.95 format for the listed wide-field applications
- Tabletop Dobsonian design without a separate tripod
- Two eyepieces and optical finder included for immediate setup
Celestron 2-Year Limited Warranty
The supplied product information lists a 2-year limited warranty for this telescope, and buyers should confirm the current US warranty terms, optical tube coverage, rocker-box coverage, included accessory coverage, registration requirements, and authorized service process before purchase because special-edition Cometron availability and package contents may vary by sales channel.
Celestron Cometron FirstScope N 76/300 DOB Specs
| Brand | Celestron |
| Full Model Code | Celestron Cometron FirstScope (76mm) |
| Country of Origin | United States / China |
| Optical Design | Newtonian Reflector (Spherical Primary Mirror) |
| Aperture | 76 mm (2.99 inches) |
| Focal Length | 300 mm |
| Focal Ratio | f/3.95 |
| Optical Coatings | Aluminum Coating with Silicon Dioxide (SiO2) Protective Overcoating |
| Secondary Mirror Obstruction | 28 mm |
| Secondary Mirror Obstruction by Diameter | 37% |
| Secondary Mirror Obstruction by Area | 14% |
| Resolving Power | 1.53 Arcseconds (Dawes), 1.83 Arcseconds (Rayleigh) |
| Limiting Visual Magnitude | 11.9 |
| Highest Useful Magnification | 180x |
| Lowest Useful Magnification | 11x |
| Optical Tube Material | Plastic |
| Focuser Style & Mechanism | 1.25-inch Standard Rack and Pinion Focuser |
| Mirror Lock Mechanism | No |
| Optical Tube Dimensions | 95.25 mm x 266 mm |
| Optical Tube Weight | 0.64 kg (1.4 lbs) - Tube Only |
| Mount Attachment Type | Manual Tabletop Dobsonian Rocker Box Configuration |
| Finder Scope Specification | 5x24 Optical Finder Scope |
| Included Accessories | 20mm Kellner Eyepiece (15x), 10mm Kellner Eyepiece (30x), Integrated Tabletop Dobsonian Mount, Starry Night Basic Edition Software |
| Standard Warranty | 2-Year Limited Warranty |
| Application | Portable manual tabletop observation, utilizing a fast f/3.95 wide visual layout to isolate moving comets and sweeping stellar fields without complex setup alignment. |


























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