Olympus 290 Series Light Cone This light cone is a compatible replacement part for Olympus 290 series flexible endoscopes (GIF-290 CF-290). It concentrates and transmits light from the fiber optic light guide to the illumination fibers running between the inner and outer shaft tubes. Key Features Accurate optical geometry for uniform illumination Durable plastic and metal construction Inspected for light transmission before shipment Direct-fit replacement, no modification