Sigma SD Quattro photosSigma SD Quattro photosBy Sam Byford Feb 25, 2016, 6:48 AM UTC|CommentsShare this storyPreviousNext1/4CommentsMost PopularGoogle quietly ends support for decade-old ChromecastTop AI researchers and CEOs warn against ‘risk of extinction’ in 22-word statementThe iPhone is dead — long live the iPhoneLisa’s Final Act: how Apple invented its future by burying its pastAmazon is discontinuing Alexa’s celebrity voices, even if you paid for themFrom our sponsorAdvertiser Content From