Pentax's tiny 110-format lens — the 24mm f/2.8 for the Pentax Auto 110 miniature SLR.
The Pentax SMC Pentax-110 24mm f/2.8 is the standard prime lens for the Pentax Auto 110 system, the world's smallest interchangeable-lens SLR system using 110 format subminiature film. The Auto 110 system demonstrated that a full SLR with TTL metering and interchangeable lenses was achievable at subminiature scale.
The lens delivers 24mm at f/2.8 for the 110 format subminiature frame, with Pentax 110 proprietary bayonet coupling for TTL metering and full SLR operation within the Auto 110 system. The 24mm provides the equivalent of a normal 50mm perspective on the tiny 110 sensor.
The Pentax 110 system is collected for its remarkable achievement of miniaturisation — the complete Auto 110 system with body and lens is smaller than many compact cameras. The 24mm was the standard lens bundled with most Auto 110 bodies.
Test Pentax 110 mount coupling. Check aperture blades. Inspect element condition. Verify the tiny lens mount engages and locks correctly. 110 film is available from some specialty suppliers though uncommon.