*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 **3nm on plano side
*Surface quality:****0 stratch/dig
*Clear Apenture>*0%
*Chamfer:0.*5mm at *5 degrees typical
*Coating:optional