The AT-X 80-400mm F/4.5-5.6 is Tokina's first line of complete range of lenses in one lens and the world's smallest zoom lens in its class. The lens also struts brightness of f/5.6 at all stages, including 400mm. Incorporating SD glass element and internal flare cutting mechanism renders clean sharp images by eliminating unwanted flare and ghosting. The zoom lens features a built-in tripod collar and enhancements in the auto focus gearing for a smoother autofocusing. The zoom lock secures the lens in its most compact position at 80mm.