Celestron Cometron 7x50 Binoculars
- 7x Magnification
- 50mm Objective Lenses
- 6.6° Angular Field of View
- Multi-Coated Optics
- BK7 Porro Prisms
- Water Resistant
- Tripod Adaptable
The Celestron Cometron 7x50mm Porro Binoculars combine large 50mm objective lenses with 7x magnification to produce a massive 7.1mm exit pupil, delivering bright, steady images ideal for scanning the night sky. With a wide 6.6° field of view, you can frame large comets or constellations, while the multi-coated optics and BK7 prisms ensure high-contrast views of the Moon's craters and faint star fields down to a limiting magnitude of 10.99.
The core of the Cometron 7x50's astronomical capability lies in its light-gathering power. The 50mm objective lenses collect a substantial amount of light, which, combined with the conservative 7x magnification, results in an extremely bright 50.41 relative brightness index and a 7.1mm exit pupil that fully illuminates a dark-adapted eye. This design makes it easy to detect faint, diffuse objects like comet tails and nebulae, while the expansive 6.6° angular field of view lets you sweep across the Milky Way or track moving objects without constant adjustment.
Weighing just 27.3 oz (774 g), the Cometron 7x50 is light enough for handheld scanning sessions, supported by the included neck strap. The rubberized aluminum housing is durable and water-resistant, protecting your optics from evening dew. For longer, more stable viewing, the binoculars are tripod-adaptable, allowing you to mount them for a shake-free view, which is essential for sharing observations or studying fine detail.
While the Cometron 7x50mm binoculars will show Jupiter's moons and reveal Saturn's shape, their primary strength is wide-field viewing, not high-magnification planetary detail. The 7x magnification is too low to resolve features like Jupiter's cloud bands or the Cassini Division in Saturn's rings. They are better suited for sweeping views of the Milky Way, locating comets, and observing large open clusters like the Pleiades (M45).
The large 7.1mm exit pupil is excellent for dark skies but can be a drawback in heavily light-polluted areas. A large exit pupil can make the sky background appear grayish and washed out, reducing contrast on faint objects. For best results with these binoculars, use them from a location with minimal city glow.
With 13mm of eye relief, the Celestron Cometron 7x50mm binoculars are usable with eyeglasses, though it may be a tight fit for some users. To see the entire 6.6° field of view, you will likely need to fold down the rubber eyecups. Observers with mild prescriptions may find it more comfortable to remove their glasses and refocus using the binocular's diopter adjustment.
The 7x50 configuration is a classic choice for astronomy for two main reasons. First, the 7x magnification is low enough to be easily held steady without a tripod, preventing shaky images. Second, the combination of 7x power and 50mm lenses creates a very bright image and a wide field of view, which is perfect for finding your way around the constellations and observing large celestial objects in their entirety.
The Cometron 7x50mm binoculars are rated as Water Resistant, not waterproof. This means they can handle dew, mist, or a light splash, but they are not nitrogen-purged and should not be submerged in water.
A tripod is not strictly necessary, as the 7x magnification is manageable for handheld use. However, using a tripod (with an adapter, sold separately) is highly recommended for extended viewing sessions to eliminate arm fatigue and provide a completely stable image, which makes it easier to spot faint details on the Moon or in star clusters.
| Magnification | 7x |
| Objective Lens Diameter | 50mm (1.97") |
| Angular Field of View | 6.6° |
| Linear Field of View | 344 ft @ 1000 yds (105 m @ 1000 m) |
| Exit Pupil | 7.1mm (.28") |
| Eye Relief | 13mm (.51") |
| Close Focus | 26.2 ft (8 m) |
| Interpupillary Distance | 56mm - 72mm (2.20" - 2.83") |
| Diopter Adjustment | ±3 |
| Twilight Factor | 18.7 |
| Relative Brightness | 50.41 |
| Limiting Stellar Magnitude | Ideal: 10.99 | Moderate: 9.99 | Poor: 8.99 |
| Lens Coatings | Multi-Coated |
| Prism Glass | BK7 |
| Prism Coatings | N/A |
| Weight | 27.3 oz (774 g) |
| Environmental Protection | Water Resistant |
| Nitrogen Filled | No |
| Tripod Adaptable | Yes |
| Dimensions | 168mm x 198mm x 64mm (6.6" x 7.8" x 2.5") |
Neck strap
× 1
Woven Nylon Carrying case
× 1
Objective lens caps
× 2
Eyepiece caps
× 2
Lens cloth
× 1
Instruction manual
× 1