*Sony and Pentax mounts are not incorporated with OS function.
About Sigma Corporation
For more than 50 years, Sigma Corporation's expertise and innovation has
driven the company's core philosophy of "knowledge, plus experience,
plus imagination," with an emphasis on producing high-quality,
high-performance photographic technology at moderate prices. This
family-owned organization is the largest, independent SLR lens
manufacturer in the world, producing more than 40 lenses that are
compatible with most manufacturers, including Sigma, Canon, Sony, Nikon,
Olympus, Panasonic and Pentax. Sigma Corporation also produces digital
SLR cameras and high-definition digital compact cameras. The company is
headquartered in Japan, with offices strategically located throughout
Europe, Asia and North America. For information, please visit www.sigmaphoto.com.