PHOTOGRAPHY By anagonzalez19 1800 Camera Obscura It use silver nitrate but the image fades after a while. Then sodium thiosulfate was used so that it did not fade 1843 Sepia or Salt Paper 1888 Kodak They made circular photos 1930 Kodachrome Color reel 1940 Polaroid 1950 it did not need a photometer to measure the light separated from the camera 1970 Instamatic 1980 Minolta first slr system with autofocus
