This is an adapter for M42 screw mount lenses to Sony NEX E-mount cameras. This mount adapter alone will not achieve infinity focus. Lenses made for film cameras and SLR cameras (old lenses) have a difference in flange back distance compared to current mirrorless cameras, and due to optical design, infinity focus is not possible. This product is intended for those who will use a M42 to M42 helicoid adapter, etc., between this adapter and the lens, and who will build or customize the adapter themselves. This product is for those who are somewhat familiar with using old lenses. Therefore, we do not accept returns or exchanges due to insufficient research, such as "couldn't be attached" or "infinity focus not achieved." Please consider purchasing after understanding the above. Immediate purchase is welcome. M42 Old Lens Enthusiast Mount Adapter Lens Adapter M42 Screw Mount Thin Adapter Modification Lens Modification DIY Adapter