The EF 50mm f/1.8 II Lens from Canon is a standard length prime lens with a fast maximum aperture of f/1.8. It is effective in low light situations and offers shallow depth of field focus. At just 4.6 oz it is a particularly lightweight lens ideal for everyday use. Gaussian optics provide sharp delineation throughout the focus range down to its minimum focus distance is 17.8 . Standard focal length 50mm lens is effective in a multitude of shooting situations and ideal for day-to-day shooting An f/1.8 maximum aperture is effective in low light situations and offers shallow depth of field