What sets the Fotodiox Pro Mount Adapter apart is its unique 1.4x Multi-Coated Focus Correction Lens, meticulously engineered for M42 lenses to seamlessly adapt to Nikon F Mount Cameras. This innovative adapter overcomes the common challenge of limited focus, often associated with direct mounts, by offering an impressive focus range extending to infinity. The adapter's 1.4x zoom factor transforms a standard 50mm lens into a 70mm lens, expanding your photographic possibilities. Despite this zoom enhancement, the Fotodiox Pro Mount Adapter maintains exceptional image quality, with users reporting no added lens distortion or chromatic aberration, also known as color fringing. This product is an ideal solution for photographers looking to unlock the full potential of their M42 lenses with Nikon F Mount Cameras. Its superior design and performance make it a valuable addition to any professional photography equipment collection.