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Neutrik’s FIBERFOX expanded beam connectors offer protection from dust and debris by sealing each fiber end with an anti-reflective coated ball lens. The lens works to eliminate the effects of dust and debris by expanding the beam to many times its original size. They are now available in two and four-channel configurations in both Single-mode and Multi-mode versions.
Read more about how they work here: https://www.neutrik.us/en-us/products/video/fiberfox
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