Leica M39 Lens to M42 Pentax screw mount 39mm to 42mm step up screw adapter ring

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This is aluminum made adapter lens adapter ring for M39 screw lens on M42 screw mount camera.You able to change all m39 lens , e.g. leica m39 lens to m42mm, then you can use all m4 2 mount adapter, such as m42/canon ; m42/nikon; m42/sony etc. Show more