plano-convex spherical lens,plano-concave spherical lens,bi-convex spherical lens,bi-concave spherical lens,meniscus spherical lens,special spherical lens,achromatic spherical lens etc.. Specification of our spherical lens as follow: *Material BK7 or other optical materials *Dimension Tolerance +0.0~-0.1mm *Center Thickness +/-0.1mm *Focal Length Tolerance+/-1% *Surface Quality:60/40 *Surface Figure: lambda/2 at 633nm on plano side *Clear Aperture >90% *Chamfer 0.25mm at 45 degree typical *Coating Optional