Sigma lenses do come with a 1 year international warranty, however, the warranty is only honoured if VAT and duty have been paid on importation into the UK, otherwise it is an illegal import. Once these taxes have been taken into account, our customers usually find it better value to buy an official UK imported lens. Sigma UK also offer an extended 2 year warranty on all EX lenses which have been imported through us. For further details click here.