Compare Tokina AT-X 235 AF PRO for Pentax to Tokina AT-X 107 DX For nikon

The AT-X 235 AF PRO is a wide-angle zoom lens that will produce dynamic images, which are sharp from edge to edge. The fast, constant maximum aperture of f/2.8 makes wide-angle photography, like reportage, effortless in difficult lighting situations such as indoors or at dusk. Two Pioneering all-glass aspherical lens elements, one front and rear, (F&R aspherical) are employed to eliminate wide-angle spherical astigmatism and correct edge/marginal light rays for superb image quality. Hoya Corporation, the world's largest optical glass manufacturer, has created a micron-tuned precision molding technique with the accuracy to form aspherical surfaces to the thousandths of a millimeter. These aspherical elements, as well as 11 more of the remaining 13, receive Tokina's unique multi-coatings to further improve optical performance. Less

The Tokina Lens was designed exclusively for use with digital SLR cameras, and combines to super wide-angle performance in a single unit. This lens makes it possible to capture images with an expanded perspective - wider than the human eye can see - including creative deformation of subjects and sharp pan focus that extends throughout the entire frame. Less