Focal Length 9mm F#1.0 Long Wave Athermalized Infrared Lens for 640x512-12um Detector

The FL9mm F/1.0 LWIR Athermal Lens is a passively temperature-compensated infrared optic engineered for 640×512–12μm detectors, delivering an exceptionally wide 50.8°×40° field of view that enables comprehensive scene capture for close-range surveillance, drone-based mapping, and indoor security applications. With a fast F/1.0 aperture and >90% average transmission across the 8–12μm band, this lens ensures bright, high-contrast thermal imagery while its athermalized construction maintains consistent focus and optical performance throughout the entire –40°C to +80°C operating range—eliminating the need for field adjustments in fluctuating thermal environments.

Weighing just 24g with compact φ22mm×21mm dimensions and an M20×0.5-6g thread mount, this lens is ideally suited for lightweight thermal cores, UAV payloads, and handheld thermal cameras where size and weight constraints are critical. The focus range spans from 1 meter to infinity, accommodating both close-quarters inspection and mid-range observation tasks. The robust housing features a durable HD coating for enhanced surface protection and environmental resilience, ensuring long-term reliability in harsh operational settings without compromising optical clarity.

FL9mm F#1.0 LWIR Athermal Lens Parameter