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 1970s-era submarine periscope retained a fully passive optical design but incorporated improved coatings, optics, and mechanical reliability. Magnification options (typically 1.5× and 8×) were paired with enhanced light-gathering capabilities, enabling better performance in low-visibility conditions. Some models began offering modular mounts for LLTV systems or IR viewers, though the core device remained analog. Manual elevation and rotation were standard, but electric assistance was becoming common in newer classes.

ROLE SUMMARY:
Category: Optical Surveillance and Targeting
Primary Use: Visual observation, fire control assistance
Function: Passive reconnaissance and target tracking
Platform: Diesel-electric and nuclear submarines (Western and Eastern bloc)
Integration: Compatible with analog or early hybrid fire control systems

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

SOURCE:
NATO submarine equipment documentation, U.S. and Soviet Cold War periscope systems