Product Description Distinguished by its bright design, Tokina opera 16-28mm f/2.8 FF is a flexible wide-angle zoom well-suited to landscape, architectural, and astrophotography applications. The f/2.8 constant maximum aperture pairs with the broad field of view range to realize an ideal lens for working in available light conditions and for using shallow depth of field techniques. The optical design incorporates aspherical and low dispersion glass elements, which help to control distortion and color fringing throughout the zoom range in order to produce sharp, clear, and color-accurate imagery. A multi-coating has also been applied to individual elements in order to suppress flare and ghosting for improved contrast when working in bright and backlit conditions. Complementing the optical design is a sophisticated focusing system, which uses a DC motor, Silent Drive module, GMR magnetic sensor, and an internal focusing design in order to provide especially quiet and quick focusing performance to suit stills and video needs. A One-Touch Focus Clutch Mechanism also allows for fast switching between autofocus and manual focus settings. Additionally, this 16-28mm f/2.8 sports a nine-blade diaphragm to produce a pleasing bokeh quality and it has a built-in lens hood to shield the bulbous front element from stray light.