【K&F】 M42-NEX K&F Concept is a one-stop refined photographic solution provider. K&F Concept specializes in design. research, manufacturing, and marketing of photographic accessories.K&F committed to creating professional and innovative products backed by friendly, responsive service to delight our distinguished customers around the world. Features: High quality and compact. Made of brass and aluminum (not plastic). 100% Brand New Color: Black Suitable for: M42 Mount Lens Sony: NEX-3 NEX-3C NEX-3N NEX-5 NEX-5C NEX-5N NEX-5R NEX5T NEX6 NEX7 NEX-F3 a6000 a6300 a6500 a5000 a5100 a3500 a3000 Alpha A7 A7R a7S, a7 II, a7S II, and a7R II a7R III a7 III, a9 NEX-VG10 VG20 Note: If your camera indicated "lens is not properly installed", please modify the camera menu settings. Usually c.