L39->M42 rings by koji kawakami

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L39->M42 rings

Left: RAFCAMERA's L39->M42 ring (2.04mm thick) on the top of M42 helicoid
Right: OASIS's L39->M42 ring (2.08mm thick) from Japan (all flange thickness)
(These rings are basically rings with L39 female and M42 male threads together.)

You can substitute these by 42-39mm step-down ring if thickness is no concern,
but these step-down rings will not fit tightly to the M42 helicoid without a gap.

other sizes: small medium large original auto

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