Canon EF 50mm f/1.4 USM The ultimate mixture of versatility and image quality. With its fast maximum aperture and rapid focusing system, the compact, high performance EF 50mm f/1.4 USM standard lens can be relied on for superb performance in any field of photography. Fast f/1.4 aperture Standard 46° angle of view USM focus motor with full-time manual focus override 45cm closest focusing distance Aspherical lens element 58mm filter size Versatile, compact standard-lens design Gaussian optics, combined with two high-refraction lens elements allow photographers working in all fields to capture crisp, clean images, even wide open at f/1.4. The lens is ideal for photographing landscapes and travel scenes as well as portraits and reportage. Ultrasonic focusing A ultrasonic motor drives autofocus extremely quickly, and in near silence. Excellent holding torque ensures the point of focus is reached accurately, without overshooting. Furthermore, full-time manual override is available, making it possible to adjust focus without leaving AF mode. Smooth background blur A virtually circular aperture diaphragm gives out of focus regions a softer, more uniform feel. Sharp foreground objects stand out against a smooth blurred background. Super Spectra coating Super Spectra coatings ensure accurate colour balance and enhance contrast. They also reduce flare and ghosting - a common problem caused by light bouncing off a camera\'s sensor.