Long Focal Length SWIR Lens has a long focal length, designed for applications in the short-wave infrared spectra, ranging from 900-1700nm. In the field of industrial lenses, ordinary fixed-focus lenses are basically 8-75mm, and those with focal length greater than 75mm can be called telephoto lens. This series of products not only covers the short-wave near-infrared band, but also has the characteristics of long-focus, suitable for outdoor monitoring, security, military and other fields.