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| optische Überwachung | |||
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| optische Beobachtungen | |||
| оптическое наблюдение: 16 phrases in 11 subjects |
| Artillery | 2 |
| Automated equipment | 1 |
| Cinema equipment | 1 |
| Electronics | 1 |
| Filming equipment | 1 |
| Infrared technology | 1 |
| Medical appliances | 4 |
| Metrology | 1 |
| Nautical | 1 |
| Optics branch of physics | 2 |
| Quantum electronics | 1 |