Sigma has a service station in Kawasaki, Japan where you can take your Sigma camera or lens for repairs. Otherwise, you can send in your product to them for repairs. They also have a toll-free number to call for inquiries. Updated: Sept. 7, 2014
Their toll-free Customer Service phone number in Japan:
0120-9977-88 (or 044-989-7436 for cell phones)
Operator hours: 9 am to 6 pm, closed Sat., Sun., and national holidays
Sigma Customer Service Dept.
Address: Kurigi 2-4-16
Asao-ku, Kawasaki, Kanagawa, Japan 215-8530
Phone: 0120-9977-88 (or 044-989-7436 for cell phones)
Fax: (044) 989-7447
Hours: 9 am to 5 pm (M-F), 9 am to 6 pm (Sat.), closed Sun., and national holidays
Directions: See map on the Web page below.
Web site: http://www.sigma-photo.co.jp/support/repair/index.html