Suitable for change the lens mount, allows mounting of M39 threaded lenses onto M42 thread mount camera bodies or adapters. The internal thread (female) is 39x1mm, the external thread (male) is 42x1mm, and the diameter is 50mm. Designed for manual focus lens and camera system integration, enables thread conversion without affecting optical alignment or flange distance Made of aluminum alloy for durability and corrosion resistance. Easy installation, can be replaced directly without adjustment, great compatibility and high reliability.
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