Chang followed his family to Shanghai on business in 1942, where he took pictures of the face of the city and the conditions of the people. After his return to Taipei in 1946, he once again supported himself with studio portraits, while continuing to focus his Leica on the real world outside.
民國卅一年，他隨著家人赴上海經商，在那兒拍攝了許多民情市容；卅五年再回到台灣後，繼續使用他的萊卡像機，一邊經營照像館拍照維生，一邊上山下海，四出獵影。