Cameras have evolved greatly since their inception from the camera obscura. Early cameras like the daguerreotype required long exposures of up to 15 minutes but emulsion plates and dry plates developed in the 1850s reduced exposure times to just 2-3 seconds. The first portable cameras emerged in the 1880s and George Eastman's introduction of flexible 35mm film in 1913 established the film standard still used today. Major developments included the first 35mm camera the UR-Leica in 1914, the invention of Polaroid cameras and instant film in 1947, and the introduction of digital cameras in 1991 which revolutionized photography. Cameras are now powerful, portable, and allow images to be captured and shared instantly worldwide on a daily basis.