The Sigma 70mm f2.8 DG Macro Art Lens For Canon EF offers outdoor photographers consistently fast and precise performance. Offering a 70mm fixed focus length, magnification goes up to a true macro 1:1. A large maximum aperture of f2.8 ensures bright imagery while the 9-bladed rounded diaphragm produces a smooth bokeh effect. Using the full time manual override, you can make minute adjustments to the fast AF. The optical build minimises chromatic aberration while the sturdy construction and rubber sealing makes this the perfect lens for travel macro photographers.