... bubble and dirts,5. Due to the glass property,the filter lens can screen the light beams as required.6. Function: Guide ... beams e.g. Fresnel lens, Plano lens, Bi convex lens, Bi concave lens, Prism, Cylindrical lens, Ball lens, Spherical lens, Aspheric lens, Meniscus lens,flat lens,round lens,filter lens7. Application: Lighting ...