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2024 Free Sample/Inquiry for Drawings 3m-5A Mc 500mm F/8 Mto Mirror-Meniscus Soviet Lens Multilayer: Generally, we use the Fedex, DHL, UPS, TNT, Shunfeng, etc. FAQQ1:Can you send me free samples or Can i have an sample order ?A: Yes, We accept sample orders, and we're also willing to send you free ...

2023 Free Sample/Inquiry for Drawings Biconcave Lens High Precision Optical Components: The biconcave lens , also named double concave lens, is usually made of flint glass and used for beam divergence. It’s focal length is negative but the parallel incident ray diverges outward. The two ...

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