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 Lenses have many applications in range from the simple collection of the scanning of laser beams to precise imaging and image transferring. Lenses are classified as singlet, achromatic cylindrical, and aspherical lens according to the different applications. Selecting the proper lens for your application requires making a number of choices. Many considerations include: lens shape, conjugate ratio, f/number, transmission, wavefront distortion, scattered light, anti-reflection coating, and cost... Base these, material is also an important factor for you to choose products. In gallery-eo, the material of BK7, Fused silica, CaF2 and MgF2 as standard. Other materials are available upon requirement.