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*Material:Bk7,fused silica,CaF2,MgF2,BaF2,ZnSe infrared optical crystals.*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
