IF YOU BUY A SIGMA LENS AND IT IS FAULTY DON'T EXPECT SYMPATHY FROM THE CUSTOMER SERVICE REPS. THEY ARE RUDE, UN-EDUCATED ABOUT THEIR PRODUCT AND IN A HURRY TO GET YOU OFF THE PHONE BECAUSE THEY ARE TOO BUSY CHATTING WITH THEIR FRIENDS ON FACEBOOK. ONE WOULD THINK THAT BECAUSE THEY MADE A PRODUCT THAT IS BELOW STANDARDS THAT THEY WOULD BEND OVER BACKWARDS TO HELP YOU OUT. BUT IT IS THE OTHER WAY AROUND. IT IS THE CONSUMER THAT TAKES IT IN THE BACK END WHEN THEY PAY SEVERAL HUNDRED DOLLARS FOR A PIECE OF CRAP SO CALLED CAMERA LENS.