Infrared Wide Angle Lens.Optional, field swappable, wide angle thermal lens allows the user to have a wider field of view for working in tight spaces. .Avoid the hassle of sending in your camera to calibrate with the lens — with smart lenses you can just attach the lens to any compatible camera and start taking images.Made of 100 PERCENT diamond-turned germanium with an engineered coating, the most efficient available material to transmit energy to the detector.