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 binoculars (typically 7×50) are specialized, waterproof, and ruggedized optical tools designed for stability and bright images in low-light, shaky maritime conditions.
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 | |









