Product Highlights: Lens of EF Mount L-Series An aperture having Range f/1.2-16 Aspherical Lens Element Autofocus Motor of Ultrasonic Manual Focus Override 18” of Minimum Focus Distance Infrared Index and Depth of Field Scale Tight Seal design Resists Moisture Filter Thread of 72mm Diameter The EF 50mm f/1.2L USM Lens from Canon is a quick prime lens featuring a specifically larger maximum aperture for valuable low-light and low depth of field ability. As a standard focal length lens, it is appropriate for most in any shooting condition and its lens covering and optical build are optimized to reduce chromatic aberrations, flare and ghosting. A really rounded diaphragm results in pleasant out-of-focus areas. An ultrasonic autofocus motor (USM) gives express, smooth and silent autofocus action and manual focus override enables for accurate manual focusing even in AF mode. With a fixed seal structure and the addition of the elective Canon protect filter, the 50mm f/1.2L lens is water and dust proof. Large f/1.2 Aperture A huge maximum aperture of f/1.2 provides marvelous speed for shooting in dimmer conditions, without using flash. The large aperture also provides smooth control over depth of field. Excellent Background Bokeh A round aperture helps to make attractive background bokeh; perfect for isolating subjects’ at huge apertures and for convincing portrait photography. Fast, Quiet Autofocus A Ring-type USM uses ultrasonic frequency vibrations to drive tremendously fast auto focus with near-silent operation. An express CPU and better AF algorithm contribute more to AF speed. Good holding torque prevents the focusing lens group with no overshoot. Permanent electronic manual focus override is available which can’t be switch out of AF. Super Spectra Coatings With superb spectra lens coverings and lens elements they determined to provide ghosting and flare which usually happens due to reflection of image sensor in digital cameras. Coverings also help attain true color balance and raise contrast for vivid hi-fidelity images. Passes Distance Information to E-TTL II The lens goes through distance information rear to the E-TTL II flash system of compatible EOS cameras to make sure optimal flash metering.