The other day, i found 2 specs of dust inside my lens.... They
weren't showing up in pictures, but it bothered me to see the spec
in my lens. I called Sigma on the phone, and asked if it were
alright if i bring my lens in to their HQ so they can clean it for
me. The woman said it would be no problem, and if i came in early
in the morning, that they would be able to service it on the spot
Fortunately for me, my folks live near Ronkonkoma NY, their US HQ,
and i'll be going there next weekend.
Just chim'n in my two cents... I think they're great for customer
service, and i'm very pleased with my cam.