Tokina AT-XAF124DXC 12-24mm Wide-Angle Lens for Canon
The Tokina AT-X 124 AF PRO DX lens is Tokina's first lens designed with an APS-C sized sensor. This lens gives the Digital Photographer an ultra wide-angle zoom lens that has the equivalent of an 18-36mm zoom range on a 35mm film camera while maintaining a bright constant aperture of f/4. Non-rotating 77mm filter threads mean special effect filters will not change when the lens' focus is changed. Fast internal focusing with Tokina's One-Touch focus clutch mechanism allows the lens to AF focus faster and switching between auto and manual focus is as easy as snapping the focus ring back and forth. 2 sharp-cut aspherical elements accurately correct aspherical aberration usually associated with ultra-wide angle lenses. Bright, constant f/4 aperture allows plenty of light to enter the camera for shooting in a wide variety of photographic situations. A chrome-plated brass mount plate and all-metal zoom unit can stand up to regular use, while an advanced polycarbonate outer lens barrel reduces the weight of the lens, making it a pleasure to carry.  Dimensions -  3.3 x 3.5 (84x89.5mm)   Weight -  20.1 ounces (570 grams)