... 2. Processing: by Molding, Grinding, Polishing3. Surface quality: optical surface quality and well controlled tolerance 4. Inside quality: clear ... and dirts,5. Due to the glass property,the filter lens can screen the light beams as required.6. ... Spherical lens, Aspheric lens, Meniscus lens,flat lens,round lens,filter lens7. Application: Lighting system, Electronics, Electrical apparatus, Industries, ...