The new AT-X M35 PRO DX lens gives the same angle of view as a 52mm lens. The close focusing distance of the M35 is amazingly close at 5.5 in.(14cm) yielding a macro ratio of 1:1 or life size reproduction with excellent sharpness. The wide f/2.8 aperture allows for easier viewing in low light situations. The front element has a newly formulated "Water Repellent" optical coating on the glass which makes it easier to clean than standard multi-coatings Tokina exclusive One Touch Focus Clutch Mechanism allows the photographer to switch between AF and MF simple by snapping the focus ring forward to AF or back towards camera for manual, everything is accomplished by the focus ring.