plano-convex spherical lens, plano-concave spherical lens, bi-convex spherical lens, bi-concave spherical lens, meniscus spherical lens, special spherical lens etc.. Specification of our plano-convex spherical lenses as follow: * Material: BK7 or other materials * Focal length: + / -1% * Center thickness tolerance: + / -0.01mm * Centrat ion: 1 arc minutes * Surface Figure: lambda/ 2 at 633nm on plano side * Surface quality: 40/ 20 stratch/ dig * Clear Apenture> 90% * Chamfer Protective: 0.25mm at 45 degree typical * Coating: optional