Image quality has been greatly improved with the EF 24mm f/1.4L II USM thanks to the addition of two high-precision aspheric lenses to correct aberration including curvature of field and distortion. Chromatic aberration common in wide-angle shooting is also combated by the inclusion of two UD lenses, ensuring optimum image quality and corner-to-corner detail. A wide f/1.4 maximum aperture allows this lens to be very effective in low light situations and provides shallow depth of field focusing. Two aspherical and two UD lens elements minimize chromatic aberrations.
The anti-reflective SWC (Sub Wavelength Coating) differs from conventional coatings by using a much finer structure, which minimizes ghosting and flaring across the lens surface, regardless of the angle with which light enters or exits. Canon’s very best autofocus mechanisms are in place, permitting full-time manual focusing override without requiring a switchover from AF to MF mode. The USM (Ultrasonic Motor) is fast and virtually silent which is ideal for discreet shooting and when using this lens to record video. The floating rear focusing system maintains performance across the entire focus range.