Focal Length 4mm F#1.2 Long Wave 8-14um Infrared Fish Lens for 640x480-17um Detector

The 4mm F/1.2 LWIR Fisheye Lens is an ultra-wide-angle infrared optic engineered for 640×480–17μm detectors, delivering an immersive 142°×110° field of view that enables near-hemispheric scene capture—ideal for panoramic surveillance, autonomous vehicle perception, drone obstacle avoidance, and situational awareness systems where maximizing coverage area is critical. With an F/1.2 aperture and >90% average transmission across the 8–14μm band, this lens ensures bright, high-contrast thermal imagery even in challenging lighting conditions, while its fixed-focus design maintains sharpness from 0.3 meters to infinity for both close-range obstacle detection and broad-area monitoring.

Weighing just 38g with compact φ29mm×31.9mm dimensions and an M25×0.5 thread mount, this fisheye lens is purpose-built for integration into weight-sensitive platforms such as UAVs, robotic systems, and compact surveillance modules. Precise back focal distances (15.7mm BFD, 9.7mm BWD, 10mm BFL) ensure straightforward optical alignment with standard thermal cores, while the lens operates reliably from –40°C to +80°C. Optional AR coatings are available to further enhance transmission and reduce surface reflections, making this lens a powerful solution for applications requiring maximum field coverage in a miniature form factor.

Infrared fish lens parameter