The Aputure F10 Fresnel Lens is an industry-standard 10-inch (250mm) glass Fresnel modifier designed for high-output Bowens Mount LED fixtures, such as the Aputure LS 600d Pro. It uses a dual-lens optical system to intensify light output, achieving up to 29,300+ lux at 3 meters when paired with the Aputure LS 600d Pro at a 15° spot angle.