L39 / M39 x 1mm thread pitch size Male to M42 female adaptor ring. Use with adapters to convert it from L39/M39 mount to M42 mount. Use to convert lens mounts.
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Hard, light, durable
Male screw thread: 39mm (L39 / M39 thread, 1mm thread pitch size).
Female screw thread: 42mm (M42 thread, 1mm thread pitch size)
Made of anodized Aluminium
adaptors, lens, etc..
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