The AT-X 11-20mm f/2.8 PRO DX Lens from tokina offers a 16.5-30mm equivalent
focal length and features a constant f/2.8 maximum aperture for maintained
brightness throughout the zoom range. One P-MO hybrid aspherical element and
two glass-molded aspherical element work in tandem to minimise distortions and
control various aberrations while three SD ultra-low dispersion elements reduce
chromatic aberrations for increased clarity. A multi-layer lens coating has
also been applied to further enhance overall light transmission and colour
accuracy by suppressing lens flare and ghosting. Well-suited to working in a
wide variety of situations, this ultra-wide zoom covers an array of wide-angle
perspectives while maintaining consistent illumination for working in
challenging lighting.