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Center Field Split Diopter NANO-B 77 mm camera filter, K&F, model KF01.2670V1
Summary description:
K&F Center Field Split Diopter NANO-B 77 mm is a camera split diopter filter designed to create a sharp focus plane at the center while keeping the surrounding field differently focused. The 77 mm threaded filter mounts to lenses with 77 mm front threads and is used for creative focus effects in photography and videography, enabling simultaneous foreground and background focus separation.