A fast, ultra wide-angle zoom lens offering excellent optical performance throughout the zoom range. A constant f/2.8 maximum aperture make this an ideal lens for low-light photography.
L-series construction and optics Constant f/2.8 maximum aperture Fast, quiet autofocus Aspherical and UD lens elements Super Spectra coatings Circular aperture for excellent bokeh Passes distance information to E-TTL II flash metering Detailed Features
The L-series is Canon's flagship professional lens range, representing the best in precision-designed EF optics. L-series lenses combine superior performance with superlative handling, and are resistant to dust and moisture.
Constant f/2.8 aperture
A fast f/2.8 maximum aperture stays constant over the full focal-length range, meaning no variation in shutter speed will occur when zooming.
A ring-type 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.