M42 Lenses

The M42 lens mount is a screw thread mounting standard for attaching lenses to 35 mm cameras, primarily single-lens reflex models. It is more accurately known as the M42 × 1 mm standard, which means that it is a metric screw thread of 42 mm diameter and 1 mm thread pitch.
This application provides a quick reference for almost M42 lenses, so you can easily check the information if you intent to buy a lens.