NanLite FL20G Fresnel Lens for Forza 200, 300 & 500NanLite FL20G Fresnel Lens for Bowens Mount NanLite NanLite FL 20 Fresnel Lens for Bowens Mount heads including larger Forza and FS lights. A glass fresnel lens with an adjustable length housing that focuses light output. Enables beam angle adjustment from spot (10) to flood (45). Includes metal barndoors and a Bowens S Type Mount. Dial In The Beam Angle The Fl 20G's rotating barrel design enables beam angle adjustment from spot (10) to flood (45)