Tokina AT-X 17-35 F4 PRO FX is a versatile wide-angle zoom lens designed for full-frame Nikon digital SLR cameras. Its fast and constant f/4 aperture provides consistent performance throughout the zoom range, making it suitable for various shooting conditions, including low-light situations. With a 17-35mm focal length range, it offers a wide perspective for capturing expansive landscapes, architecture, and group shots. The lens features a one-touch focus clutch mechanism, allowing quick switching between autofocus and manual focus modes.