Radius (R): -51.680mm & Center Thickness (CT): 3.5mm
Edge Thickness (ET): 3.89mm & Back Focal Length (BFL): -102.30mm
Precision N-BK7 plano-concave lens with excellent wavefront accuracy. Ideal for beam expansion, projection systems, and aberration correction. Features negative focal length design, broadband transmission, and serves as coating substrate. Quality-inspected for reliable performance.