Plano-Convex Lens is widely use in optical display systems, projection optics systems, imagining optical systems, and laser measurement systems. It is best use where conjugate point-- object distance, S or image distance S' is more than five times of the other. This lens is almost the most super form for both collimating a point source and focusing collimated ligh Specification of our plano-convex spherical lenses as follow: * Material: Bk7 or other materials * Focal length: + / -1% * Length tolerance: + 0.0 ~ -0.1mm * Width tolerance: + 0.0 ~ -0.1mm * Center thickness tolerance: + / -0.1mm * Surface Figure: lambda/ 2 at 633nm on plano side * Surface quality: 60-40 stratch/ dig * Clear Apenture> 90% * Chamfer: 0.25mm at 45 degree typical * Coating: optional