DESCRIPTION

The AT-X 17 AF PRO lens features the exclusive "Focus Clutch Mechanism", a signature of the Tokina PRO series lenses which provides a faster, smoother autofocus operation with a smooth manual focus action not normally found in autofocus lenses. The updated PRO features a floating element autofocus system, an all-glass aspherical lens element, & an aluminum lens barrel with a chrome-plated brass mount plate. The lens elements are made of higher quality HLD (high refection, low dispersion) glass for better resolution and contrast. The filter size has been changed from 72mm to a 77mm, so its now possible to have Tokina professional lenses that cover a range from 17mm to 300mm with just one size of filters.