Dear sir/madam: We are Changchun Shuangsheng Optics Co.,ltd of China. The Double Prosperous Optical Instrument Factory is located in Changchun City of Jilin Province of China. In recent years, our company introduces into large quantity of high accuracy optical instrument equipments and advanced pipelining from France, Japan, South Korea and etc. Therefore, accomplished advanced industry, multiform species and large scales optical entrepreneur. Currently, we have four greatest spectrum: telescope, riflescope, camera lenses, refraction examine instrument and more than one hundred and seventy species such as zoom lenses, viewfinder, WYFD anti-icing fluid an cell liquid checking instrument and hand-saccharometer. Our factory designs light, machine, electricity incorporate CCD lens, computer absorb image caput, fingerprint-distilled apparatus of the three greatest spectrum high-tech product independently for leading product of my factory. The optical fitting device of our company are veneer lenses, meniscus lenses, plano-convex lenses, plano-concave lenses, bi-convex lenses, bi- concave lenses, prisms, plan lenses, spherical lenses, non- spherical lenses, cylindrical lenses, aspherical cylindrical lenses, reflect lenses, filter lenses, polarize lenses, wave lenses and so on. All the materials are all wool and a yard wide optical glass and optical crystal. The best SURF can get to 10-5, the surface precision can get to 1/20-1/50, the size can get to 1.5mm-100mm,and also can coating all kinds of optical devices. Far-sell to Japan, America, Taiwan, Southeast Asia and etc. Welcome overseas cooperate with our company and develop new optical product together. The wish dose your cooperate the colleague faithfully. Factory director double general manager: Bingwu Wang best regards! Lillian Sender: Meiling Qin (秦美玲)　 FAX : 86-431-2843885 TEL : 86-431-2843885 Address: No.1 Dongdaqiao street, Nanguan area, Changchun, Jilin 130041 China （中国）吉林省长春市南关区东大桥街1号 130041