英语演讲-相机介绍.ppt

1、Camera :A powerful machine,Can you imagine a world without cameras?,How Do Cameras Work?,First, close your eyes. Now quickly open and shut them. What did you see? You saw an image, or “picture,” from your surroundings.,A basic camera works a lot like your eyes.,Try this:,How Cameras Change The World

2、,The camera brought the whole world into peoples homes,ordinary people could afford to have snapshots of themselves,Thanks to the motion-picture camera , we have television and movies.,Cameras Everywhere,A point-and-shoot camera automatically focuses the lens and controls how quickly the shutter ope

3、ns and closes.,Cameras Everywhere,Many banks, stores, and schools use security cameras to watch what people are doing.,Cameras Everywhere,Cameras are important tools for scientists.,Doctors use tiny cameras to look inside the human body. Cameras on satellites orbit Earth, taking pictures of weather

4、patterns. Cameras bring us pictures from the deepest oceans, the insides of volcanoes, and even of distant galaxies in space!,History,The forerunner to the photographic camera was the camera obscura (暗箱). In the fifth century BC, the Chinese philosopher Mo Ti noted that a pinhole can form an inverte

5、d and focused image, when light passes through the hole and into a dark area.,Some Significant Camera,1921 Kodak,Opened up Cine Kodak, used 16mm movie film,Silvestri Flexicam,Voigtlnder Brillant twin-lens reflex camera,ContaxS of 1949 the worlds firstpentaprismSLR,1952 Voigtlander Vito II,Some Significant Camera,AsahiflexIIa of 1955,AsahiflexIIa of 1955,Nikon Fof 1959 the first 35mmsystem camera,Voigtlnder Vitoret of 1962,1988 A Soviet-era LOMO LC-A camera,Canon EOS 300D, a model that sparked the popularity of consumer-