Wesupplyasphericallens.Specificationofasphericallensasfollow:Material:BK7orotheropticalmaterialSize:10mm-200mmFringes:lambda/2CenterThickness:15nm-25nmDispersionround:0.03mm-0.2mmCentration:3arcminSurfaceQuality:60-40Scratch/DigClearAperture:90%Coating:***ailableuponRequest)