Currently there are 8 native Wideangle Prime 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 Prime lenses with Weather Sealings.