The Tokina AT-X 11-16mm f/2.8 PRO DX II is a compact ultra-wide angle zoom lens designed for Canon APS-C DSLR cameras. Featuring a constant f/2.8 maximum aperture throughout the 11-16mm focal range, this lens excels in low-light photography while maintaining excellent optical performance across the entire zoom. The optical design incorporates two Super-Low Dispersion glass elements and two aspheric elements to deliver outstanding contrast, sharpness, and minimal chromatic aberration. Tokina's One-Touch Focus Clutch mechanism allows you to seamlessly switch between autofocus and manual focus with a simple push or pull of the focus ring, whilst the internal focusing motor ensures responsive AF performance without changing the front element diameter. With its versatile ultra-wide perspective and superior build quality, this secondhand lens is ideal for landscape, architecture, and environmental photography.