Traditionally, light-focusing systems have consisted of either a lens, or a reflector. The Advanced Focus System (AFS) is the patented combination of a reflector AND lens to create a light system that provides both a focused beam for long-distance and a homogenous spill-beam for up-close reading. AFS means whether you’re reading a map up close or focusing down the path to a landmark in the distance, your light will be easy on the eyes, clear and bright.