FLIR Optional Lenses – T5xx, T8xx, & EXX SeriesFLIR Interchangeable lenses for use with T5xx, T8xx, & EXX Series thermal imaging cameras. Interchangeable lenses allow you to adapt your Thermal Imaging Camera to almost any situation. Magnifying distance objects or increasing your field of view. WHAT LENS DO YOU NEED? 14, 29 mm lens: this telephoto lens has a narrow field of view for precise focus and crisp imaging of distant targets. 24, 17 mm lens: often considered the standard lens, the 24 18