Currently there are 8 native Wideangle Zoom lenses for Sigma SD1 and all of these lenses are autofocus (AF) type.
Sigma SD1 doesn't have a sensor based image stabilization system and none of these lenses have optical Image Stabilization.
Since Sigma SD1 has environmental sealings (Weather Sealing), you may like to couple your camera with one of these 2 Wideangle Zoom lenses with Weather Sealings.