LENS AUTOFOCUS DONT WORK MANUAL FOCUS ONLY!!! The AT-X 100 PRO D is a macro lens capable of life-sized (1:1) reproduction at 11.8 inches (30 cm). The lens multi-coating has been re-engineered to match the highly reflective silicon based CCD and CMOS sensors in today's digital SLR cameras. This lens gives the higher of both worlds because optics still give full coverage and excellent sharpness on 35mm film. A macro lens that can handle both the digital and film worlds with ease. Specifications: Zoom range: 100 mm Maximum aperture: F/2.8 Minimum aperture: F/32 Optical construction: Nine elements in eight Groups Angle of view: 24 degrees 30' Minimum focus distance: 11.8" (30 cm) Macro ratio: 1:1 Focus limiter: 1.28 to infinity Number of diaphragm blades: 9 Filter size: 55 mm Width: 73 mm Height: 95.1 mm Weight: 19 oz (540 g) Dedicated lens hood included