FL35mm F#1.0 Long Wave 8-12um Athermalized Germanium Lens for 640x512-12um Detector

The 35mm F/1.0 LWIR Athermal Lens is a passively temperature-compensated infrared optic designed for 640×512–12μm detectors, offering a well-balanced 12.5°×10° field of view that is ideal for medium-range surveillance, perimeter security, and target recognition applications. With a fast F/1.0 aperture and >88% average transmission across the 8–12μm band, this lens delivers bright, high-contrast thermal imagery while its athermalized design ensures stable focus and optical performance without the need for manual refocusing across the entire –40°C to +60°C operating temperature range—a critical feature for systems deployed in thermally unstable environments.

Weighing just 74g with compact φ43.4mm×39.9mm dimensions and an M25×0.5-6g thread mount, this fixed-focus lens is engineered for seamless integration into portable thermal cameras, UAV gimbals, and compact surveillance systems. The focus range extends from 0.3 meters to infinity, supporting both close-up inspection and distant observation. Dual DLC and AR coatings are applied to enhance surface durability and anti-reflective performance, ensuring reliable operation and optical clarity under demanding field conditions.

35mm F#1.0 LWIR Athermal Lens Parameter