The Tokina AT-X DX macro lens is a fisheye zoom lens with an aperture of f/3.5 to f/4.5.This Tokina camera lens for Canon devices can change from a 10 mm to a 17 mm focal length. The Tokina AT-X DX macro lens has a format compatibility to a 35 mm camera of full-frame digital sensor capacity of the Canon APS-C. It has an exceptionally wide 180-degree to 100-degree angle of view. The Tokina camera lens for Canon has a minimum focus distance of 13.97 cm and a magnification of 0.39x. The maximum reproduction ratio of this fisheye zoom lens is 1 to 2 to 56. The optical elements are in eight groups of 10 elements with six diaphragm blades. It does have the ability to autofocus as long as it is connected to a camera with the same functionality. The Tokina camera lens for Canon has a depth of 6.9 centimeters and a length of 7.09 centimeters. It weighs 349 grams.