Sigma 135mm F1.8 DG HSM
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Sigma 135mm F1.8 DG HSM

The 135mm F1.8 offers a minimum focus distance of 0.875 meters (2.9 feet). It uses a hypersonic motor to focus, which Sigma says should result in fast and 'exceptionally stable' AF. And a acceleration sensor 'detects the orientation of the lens' so the AF system can respond to 'varying loads on the focusing group due to gravity.' In laymen's terms, this means that autofocus should be just as fast, and just as accurate in both portrait and landscape orientations.