The Canon EF-mount 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 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. Constant f/2.8 maximum aperture offers consistent performance and excellent light transmission throughout the zoom range. Three glass-molded low dispersion elements greatly reduce color fringing and chromatic aberrations in order to produce greater clarity and color accuracy. Multi-coating has been applied to individual elements to suppress flare and ghosting in order to achieve greater contrast and color fidelity when working in strong lighting conditions. 

Tokina Opera 16-28mm F/2.8 Specs