. . . . . . . . . . . "Sigma" . "Sigma's" . . . . . . "SD-series" . . . . "Sigma Corporation#Cameras" . . "1961" . . "Sigma Corporation" . "Sigma Group" . . . . . . . "SIGMA" . . "Sigma 45mm F2.8 DG DN" . . . "Sigma_Corporation#Software" . . "Sigma Corporation" . . . "1135" . . . . . . . . "here" . . . "Sigma Corporation#Quantaray" . . "\u682A\u5F0F\u4F1A\u793E\u30B7\u30B0\u30DE" . . . . "Sigma designations" . . . . . . . . .