The Sigma 24-70mm f/2.8 EX DG Macro DF lens has now been optimized to capture superior quality images even with digital cameras. DG is a designation Sigma uses on lenses featuring optical systems designed to meet the performance characteristics of digital SLR cameras.
Responding to the demands from professional photographers for a constant aperture zoom lens with a wider view, this lens covers focal lengths from 24mm ultra wide angle to 70mm medium telephoto with a bright viewfinder and easy AF/MF all the way through.
• Three aspherical lens elements minimize spherical aberration, astigmatism and sagittal coma flare
• Use of two SLD (Special Low Dispersion) elements results in excellent correction of chromatic aberration (the propensity of different colors of light to focus before and after the film plane)
• DF (dual focus) mechanism is incorporated, making it easy to hold the lens during AF while providing a wide focus ring for easy manual focus
• Non-rotating lens front allows the use of a flower shaped "Perfect Hood" and makes employing polarizing filters a snap
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