The large aperture also provides fine control over depth of field for compelling portrait photography.  A floating

optical system and high precision aspherical lens element reduce aberrations and contributes to excellent

imaging performance even at the maximum aperture. Super Spectra lens coatings minimize reflections,

reducing flare and ghosting.

Retaining the impressive optical performance and large aperture of its predecessor, this lens has been

improved with a ring-type ultrasonic autofocus motor (USM), high-speed CPU and optimized algorithms to

achieve fast, smooth and quiet autofocus. Manual focus override enables precise manual focus at any time,

even in AF mode. The truly circular aperture creates a shallow depth-of-field that brings attention to the subject

and blurs the background, which is ideal for portraits. This L-series lens features weather-sealing to protect the

lens from damage brought on by moisture and dust.