580 - Frame Only580 Frame Only DOES NOT INCLUDE ANY LENSES! The 580 is a fully optimized interchangeable dual lens system. This new frame geometry is designed for both the serious clay shooter as well as the sportsman in the field. Unique to this design is a visual experience not found in any dual lens frame styles. The nose architecture is built to sit on the face reducing the eyes perceptive awareness of the nose. When the shooter is looking across the bridge,