Tokina's AT-X 280 AF PRO is a 28-80mm autofocusing zoom lens with a constant aperture of f/2.8. This lens is from Tokina's ultra high-quality AT-X AF PRO series. It is constructed with high quality multicoated optical glass, aspherical lens elements one SD (super low dispersion) element.
This lens features a more refined version of Tokina's exclusive Focus Clutch Mechanism, which provides the best manual focus dampening of any autofocus lens. You're able to switch from autofocus to manual focus anytime, anywhere merely by pushing or pulling the focusing ring. This eliminates the need to touch the switch on the body of the camera; just leave the switch set to AF and pull back the focusing ring when you only desire MF.