A:Answer from sigmas website
Beginning July 1, 2013, all brand new Sigma Products purchased from a USA authorized Sigma dealers are covered for 4yr USA warranty against defects in manufacturing and workmanship only. Your warranty period begins the day you purchase your Sigma camera, lens and/or flash and runs for a period of four years total from that date. (Please refer to the warranty policy included with your product or see the warranty registration page for each Sigma Product). Please note that the Sigma warranty is valid only to the original purchaser and is not transferable. When sending your Sigma product in for warranty service, please be sure to include a copy of the original sales receipt as proof of purchase date (the start date of your warranty). Anything deemed beyond normal use will void any and all warranties.
