One of the most versatile focal lengths available, Tokina's AT-X 24-70mm f/2.8 PRO FX Lens is a standard wide-angle to portrait-length zoom featuring a bright, constant f/2.8 maximum aperture. Designed for Nikon FX-format DSLRs, this everyday lens is ideally suited for nearly any genre of photography, including travel, portraiture, landscape, and event shooting. Three aspherical elements pair with three super-low dispersion elements to produce bright, evenly-illuminated imagery with controlled aberrations and distortions, while multi-layer lens coatings help to reduce flare and ghosting for improved contrast and color accuracy. Well-suited to working in a wide variety of situations, this standard zoom covers an array of perspectives while maintaining consistent illumination for working in challenging lighting. Benefitting the usability, a one-touch focusing clutch permits quick switching between autofocus and manual focus modes, and an internal focusing design maintains the overall length of the lens during use. A Silent-Drive Module AF system suits both stills and video recording, too, by providing quick and quiet performance. Additionally, this lens sees the incorporation of a nine-blade diaphragm, which contributes to a pleasing out-of-focus quality when employing shallow depth of field shooting techniques. Compatible with Nikon FX-format DSLRs, this standard zoom can also be used with DX-format DSLRs where it will provide a 36-105mm equivalent focal length range. Constant f/2.8 maximum aperture provides consistent performance throughout the zoom range and also contributes to greater control over focus position and when working in low-light conditions