nikon ai-s fx nikkor 50mm f/1.2 fixed zoom manual focus lens for nikon dslr cameras nikon the nikon nikkor 50mm f1.2 ais manual focus lens is a manual focus lens and is not for use with digital slr cameras. fastest normal manually focusing nikkor lens. professional photographers make nikkor lenses their lenses of choice. nikon is committed to every aspect of lens manufacturing, maintaining clarity, sharpness, focusing accuracy, range and reliability.this product is designed for the use with nikon ais.