SOLAS requirements for totally enclosed lifeboats
By marinesafety
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Binocular 7×50 configuration provides a 7x magnification, which is low enough to keep images steady on a moving vessel, and a 50mm objective lens that gathers enough light for effective use at dawn, dusk, or in poor sea weather.
Marine binocular (typically 7×50) is specialized, waterproof, and ruggedized optical tools designed for stability and bright images in low-light, shaky maritime conditions.
Designed specifically for harsh salt‑spray, high‑humidity and constantly‑vibrating marine environments, they enable navigating officers and lookouts to detect distant vessels, navigation buoys, floating obstacles, distress signals and survival craft far beyond the range of naked‑eye observation.
Marine navigation, observation and boating
| Model | 7×50 | 10×50 |
| Magnification | 7× | 10× |
| Objective Lens Size | 50mm | |
| Eye Lens Size | 22mm | |
| Field of Vision @ 1000m | 132m | |
| Close Focus | 3m | |
| Exit pupil | 23mm | |
| Focus | Individual Focus | |
| IP | IPX7, Water-proofing and fog-proof (nitrogen-purged) | |
| Prism | BaK-4 polo prism | |
| Power Source | 2×LR45/LR936 (lluminated compass) | |
| Compass and reticle | Optional | |
| Material | Aluminum covered anti-slip rubber armor | |
| Optical coating | Fully multi-coated anti-reflective green film | |
| Color | Green, Black, Camouflage | |