OVERVIEW: An optical submarine periscope is a retractable mast that allows submariners to observe the surface environment while remaining submerged at periscope depth. It uses a direct line-of-sight system of mirrors and lenses to transmit visual information to the submarine's interior, enabling passive surveillance, navigation, and targeting without exposing the vessel significantly.

GENERAL DESCRIPTION: Submarine optical periscopes in the 2000s maintained high-performance visual capability with enhanced optics, improved stabilization, and the integration of digital displays. These systems often supported overlays for rangefinding and digital image capture. While still relying on line-of-sight mechanical masts, they incorporated upgraded electric drives, better anti-reflective coatings, and interfaces for networked combat systems.

ROLE SUMMARY:
Category: Optical Surveillance and Targeting
Primary Use: Surface observation and targeting
Function: Passive reconnaissance and navigation
Platform: Modernized submarines using legacy masts (non-photonics)
Integration: Linked to LLTV, IR sensors, and combat data systems

See Specific information under [Sensors/EW] and [Properties] sections.

SOURCE:
U.S. Navy Submarine Visual Systems Guide (2000s), Jane’s Submarine Equipment Manuals