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Optical Glass Fused Silica Optical Achromatic Lens K9 Bk7 Glass Lens. High Transmittance: Transmittance exceeds 95% for superior optical performance. Customized Options: Available for specific applications and operating temperatures. Multiple Material Options: Offered in K9, BK7, and Fused Silica optical glass. Wide Application Range: Suitable for lighting, medical, optical, and photography uses. International Certifications: Certified with RoHS and ISO9001 standards. Factory Direct Supply: Professional manufacturer ensuring better quality and lower price. Fast Delivery: Standard size delivery within 7-14 days. Free Sample Availability: Samples provided free of charge, freight cost applies.