Features L-series construction and optics Large f/1.2 aperture Fast, quiet USM auto focus Super Spectra Coatings Circular aperture for high background bokeh Provides distance information for the E-TTL II flash system Soft case and lens hood L-series QualityThe EF 50 mm f/1.2L USM incorporates Canon's high standards of precision optics. The L-series is Canon's flagship professional lens range, combining high image performance and optimum operability with dust and moisture resistant construction. Large f/1.2 ApertureA large maximum aperture of f/1.2 provides high speed for shooting in low light conditions, without the need for flash. The large aperture also provides fine control over depth of field. High Background BokehA circular barrel aperture helps to create background bokeh, suitable for isolating subjects at large apertures and for compelling portrait photography. Fast, Quiet Auto FocusA Ring-type USM (Ultrasonic motor) uses ultrasonic frequency vibrations to drive rapid auto focus with near-silent operation. A high-speed CPU and improved AF algorithm contribute further to AF speed. The holding torque stops the focusing lens group without overshoot. Full time electronic manual focus override is available without having to switch out of AF. Super Spectra coatingsSuper Spectra lens coatings and lens element shaping suppress flare and ghosting - more prone to occur with digital cameras due to reflection off the image sensor. Coatings also help achieve true colour balance and increase contrast for vivid hi-fidelity images. Passes Distance Information to E-TTL IIThe lens passes distance information back to the E-TTL II flash system of compatible EOS cameras to ensure optimal flash metering. AccessoriesThe EF 50 mm f/1.2L USM lens comes supplied with a cylindrical lens hood and a soft case. Other Characteristics: Closest Focusing Distance: 0.45 mColour of Product: BlackCompatible Products: Canon EOSComponent For: SLRDiameter: 8.54 cmFilter Size: 7.2 cmFixed Focal Length: 1.2 mmFocus Adjustment: Auto/ManualLength: 6.55 cmLens Mount Interface: Canon EFLens Structure (Elements/Groups): 8/6Maximum Aperture Number: 50Ultrasonic Motor (USM): YesWeight: 545 g