CCTV LensWe make Lens with diameter from 2mm to 250mm,the output reached 4,000,000pcs per month1,Raw meterial:borosilicate glass,pyrex,borofloat,folat glass,optical glass,crystal glass2,Processing:Milling CG---Grinding--Polishing--Centering--Clenning---Coating--Cementing--Painting3,Function:ball...