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: Optical periscopes used on submarines during the 2010s were advanced visual systems combining traditional optics with digital video capabilities, stabilization, and low-light performance. These systems were primarily retained on legacy submarines or export-oriented platforms, offering zoom-capable lenses, digital overlays, and interfaces to centralized display and fire control systems.

ROLE SUMMARY:
Category: Optical Surveillance and Targeting
Primary Use: Surface observation and target identification
Function: Passive visual reconnaissance
Platform: Legacy and transitional submarines (non-photonics)
Integration: Interfaces with LLTV, IR, digital display systems, and fire control

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

SOURCE:
Jane’s Underwater Warfare Systems (2010s), Naval Submarine Combat Systems Briefs