With 25 mm focal length (50 mm for 35mm standard) and 47 degree angle of view, this premium fixed focal length lens is optimal for many types of photography. It offers a high quality optical performance with elegant bokeh at open aperture and impressive close-up quality. At the same time, it delivers photos with a field of view that appears natural to the human eye. Ideal processing and high quality metal bayonet; nearly silent high-speed autofocus. The combination of cutting-edge optical technology, intuitive handling, and certified splash and dust-proof construction makes this lens an invaluable tool for photographers seeking creative flexibility and uncompromising reliability.