Enhance your photography experience with the FotodioX Mount Adapter, a high-quality, durable tool designed to connect your Leica M39 lens to a Mamiya 645 camera. This versatile adapter is perfect for both Slr and Dslr camera users who wish to maximize the potential of their existing lenses, offering a cost-effective solution to buying new ones. The FotodioX Mount Adapter is part of our Pro-Series line, a testament to its superior craftsmanship and adherence to pristine award standards. It's designed to withstand the rigors of repeated lens mounting and unmounting, ensuring longevity and consistent performance. Its unique, compact design not only maintains but also enhances the professional appearance of your camera setup.This mount adapter is specifically designed to allow Leica Visoflex M39 lenses to fit seamlessly onto Mamiya 645 Mf or Afd Pro camera bodies. Please note, it is not compatible with the E series. While the lens will fit physically, automatic diaphragm, auto-focusing, or any other functions may not operate correctly while using this adapter. In such cases, the ""stop-down mode"" will need to be used when metering, as the lens does not have the ability to have its aperture controlled by the camera body. However, infinity focusing is guaranteed.By adapting larger format lenses to smaller format sensors, this mount adapter provides excellent edge-to-edge sharpness. The smaller image field helps minimize the effects of lens distortion and aberration by utilizing the 'sweet spot' or center of the larger lens image circle. In essence, the FotodioX Mount Adapter for Leica M39 Lens to Mamiya 645 Camera is an affordable, high-quality tool that offers versatility and durability for photographers looking to expand their lens options..