Wide Zoom Range The new Tokina AT-X 12-28mm f/4 lens has a super-wide to standard zoom range while maintaining a constant f/4.0 aperture. This is a very versatile lens for scenery, street scenes, and event coverage. The lens is designed for DSLR cameras with APS-C (DX) sized sensors.
New Optical Design A new optical design using aspherical elements and super-low dispersion glass matches even the highest mega-pixel DX sensors cameras available today. One aspherical lens element is positioned in the front group. This together with another precision molded glass aspherical lens element placed in the rear group ideally focuses marginal light rays and maintains sharpness at the edges while also correcting distortion. The use of two different SD (Super-low Dispersion) glass elements, type FK01 and FK03, correct chromatic aberration. The combination of all these specialized elements yield excellent sharpness and color.
New Auto Focus Mechanism The new AF “GMR magnetic precision” control sensor is capable of fast auto-focus. Tokina places the new sensor closer to the drive unit for faster communications between the controller and AF motor. This combined with the motor's high-precision focus control yields faster, more accurate auto-focus.
Additionally, a brand new “SD-M” (Silent Drive-Module) has greatly lowered the sounds emitted by the auto-focus drive system allowing for much quieter AF. Both Canon and Nikon mounts have a built-in AF motor to make them auto-focus compatible with all current camera bodies.
Compact Body Design The Tokina AT-X 12-28mm f/4 compact design makes the lens easy to carry and handle. Manual focus is achieved through Tokina's one-touch focus clutch AF/MF mechanism. Simply slide the manual focus ring forward for auto-focus or back for manual focus operation. The lens focus ring is damped in the manual mode for smooth and precise focusing.
Specifications Focal Length: 12-28mm Equivalent Focal Length:18-42mm Nikon / 19-45mm Canon Maximum Aperture: f/4 Minimum Aperture: f/22 Optical Construction: 14 Elements / 12 Groups Coatings: Multi-layer coatings Angle of View: 99.37° to 54.73° Minimum Focus Distance: 9.8 in. (25cm) Reproduction Ratio: 1:4.94 Zooming System: Rotary Zoom Number of Diaphragm Blades: 9 curved blades Filter Size: 77mm Maximum Outer Diameter: 3.31n. (84mm) Dimensions: 3.31in. (84mm) x 3.54L in. (90mm) Weight: 18.70 oz. (530g) Lens Hood: BH-77B