One of the exhibits, "Studio camera". Hong Kong' s first photo studio opened in Central in 1845. Before the Second World War , photographers used glass negatives, instead of plastic filmstrips, to take photographs. Photosensitive solution was applied on the glass negative before a photograph was taken. Yet because it took longer for the glass negative to respond to light, the subject often had to pose in front of the camera for more than 10 minutes before one photograph was taken.   Close