Borg Oasis M42P1 to M39AD Conversion Adapter Part Number: 7844 5,720 yen (tax included) Used to attach Leica L-mount lenses to Sony mirrorless cameras for shooting. Will be carefully packaged and shipped. This is a conversion adapter for attaching M39 screw lenses (Leica screw, enlarging lenses, etc.) to M42 helicoids. Of course, it is also possible to directly attach Leica L-mount lenses to Praktica mount camera bodies. *The thread pitch of Leica L-mount lenses is technically 24 threads per inch, but we use P1. Recently, combinations of attaching enlarging lenses to mirrorless interchangeable-lens cameras with short flange back distances, such as Micro Four Thirds and Sony E-mount (NEX), have become popular. They are small and high-performance, making them ideal for mirrorless interchangeable-lens cameras.