FL40mm F#1.0 LWIR Athermalized Lens With DLC Coating for 640x512-12um Detector

The 40mm F/1.0 Athermalized LWIR Lens is a passively temperature-compensated infrared optic engineered for 640×512–12μm detectors, delivering a well-balanced 10.8°×8.7° field of view that is ideally suited for medium-to-long-range surveillance, perimeter security, and target identification applications. With a fast F/1.0 aperture and >86% average transmission across the 8–12μm band, this lens ensures excellent thermal sensitivity and image clarity, while its athermalized construction maintains stable focus and optical performance across the full –40°C to +80°C operating temperature range—eliminating the need for manual or motorized refocusing in rapidly changing thermal environments.

Weighing just 103g with compact φ47mm×46.5mm dimensions and an M41×0.75-6g thread mount, this fixed-focus lens is designed for straightforward integration into portable thermal cameras, UAV payloads, and compact surveillance systems. The focus range spans from 1 meter to infinity, supporting both intermediate and long-distance observation tasks. Optional DLC coating is available to enhance surface hardness and environmental resilience, ensuring long-term reliability in harsh field conditions without compromising optical performance.

40mm F1.0 Athermalized Infrared Lens Parameter