BO40 10x50 Large-Eyepiece Observation Binoculars
Bring distant detail closer with a 10x50 binocular that feels steady, bright, and satisfying in regular use.
BAK4 prisms and FMC coatings and a confidence-inspiring build make it a strong pick for long-distance scenic viewing, shoreline observation, and lookout use.
Technical Specifications
| Category | Binoculars |
|---|---|
| Magnification | 10x |
| Objective Lens Diameter | 50 mm |
| Eyepiece Diameter | 23 mm |
| Field of View | 109 m at 1000 m / 6.2° |
| Prism Type | Porro prism |
| Prism Glass | BAK4 |
| Lens Coating | FMC |
| Exit Pupil | 5 mm |
| Focus System | Independent left and right eyepiece focus |
| Diopter Range | +/-3 |
| Body Size | 195 x 180 mm |
| Net Weight | 1055 g |
| Packed Weight | 1510 g |
| Box Size | 23.5 x 11 x 22 cm |
| Included Accessories | Binoculars, carry bag, neck strap, manual, cleaning cloth, retail box |
| Phone Capture | Source graphics show phone shooting with an external adapter setup, not a confirmed included accessory |
| Best For | long-distance scenic viewing, shoreline observation, lookout use, wildlife viewing, and fixed-position stargazing |
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| Category | Binoculars |
|---|---|
| Magnification | 10x |
| Objective Lens Diameter | 50 mm |
| Eyepiece Diameter | 23 mm |
| Field of View | 109 m at 1000 m / 6.2° |
| Prism Type | Porro prism |
| Prism Glass | BAK4 |
| Lens Coating | FMC |
| Exit Pupil | 5 mm |
| Focus System | Independent left and right eyepiece focus |
| Diopter Range | +/-3 |
| Body Size | 195 x 180 mm |
| Net Weight | 1055 g |
| Packed Weight | 1510 g |
| Box Size | 23.5 x 11 x 22 cm |
| Included Accessories | Binoculars, carry bag, neck strap, manual, cleaning cloth, retail box |
| Phone Capture | Source graphics show phone shooting with an external adapter setup, not a confirmed included accessory |
| Best For | long-distance scenic viewing, shoreline observation, lookout use, wildlife viewing, and fixed-position stargazing |
Bring distant detail closer with a 10x50 binocular that feels steady, bright, and satisfying in regular use.
BAK4 prisms and FMC coatings and a confidence-inspiring build make it a strong pick for long-distance scenic viewing, shoreline observation, and lookout use.
- 10x50 delivers a confident balance of reach, brightness, and everyday usability.
- BAK4 prisms and FMC coatings help keep the view clearer, brighter, and more natural.
- Phone-friendly use makes it easier to capture the view and share standout moments.
- Accessories like binoculars, carry bag, neck strap, and manual help it feel ready right out of the box.
Choose the version that matches how you like to watch
Different variants give you room to match the optic to your routine instead of settling for a one-size-fits-all setup. Whether you want a wider, easier view or a little more reach, the lineup makes it easier to pick the version that feels right in your hands and in the field.

Clear optics make every scene look brighter and more natural
BAK4 prisms and FMC coatings work together to keep the image cleaner, with better contrast and a more natural sense of detail. That means you can enjoy a view that feels sharper and more premium from the first glance, whether you are watching wildlife, landmarks, or open landscapes.

Comfortable handling helps you settle the view faster
Details such as independent left and right eyepiece focus make it easier to get comfortable, dial in focus, and stay with the scene longer. That everyday ease matters because the best optic is the one that feels natural enough to use often.

Built to go outside with more confidence
Weather-ready construction gives you extra peace of mind when conditions are damp, misty, or unpredictable. Combined with a secure body design, it helps the optic feel ready for real outings instead of being something you only trust in perfect weather.

Why It Performs in the Field
Expect a brighter, calmer view with the kind of coatings and optical design that make detail easier to catch when the light changes or the distance stretches out.
The shape, balance, and weather-ready build are chosen to feel comfortable in real use, so longer walks, travel days, hides, and shoreline sessions stay enjoyable.

