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: The 1990s-era submarine optical periscope featured high-quality multi-element lenses, better stabilization, and integration with digital readouts. These periscopes often included automatic focusing, electric motorized traverse and elevation, and compatibility with night vision or infrared attachments. Advanced coatings reduced glare and enhanced low-light performance, while displays were increasingly connected to digital consoles.

ROLE SUMMARY:
Category: Optical Surveillance and Targeting
Primary Use: Visual reconnaissance and navigation
Function: Passive observation, surface and aerial threat identification
Platform: Conventional and nuclear submarines globally
Integration: Compatible with LLTV, IR, laser rangefinders, and digital fire control systems

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

SOURCE:
Jane’s Underwater Warfare Systems (1990s editions), U.S. Navy Submarine Equipment Reference Guides