There are many types of lenses. Wide angle lenses are used to get more of a perspective of whats around you. People can reefer to them a fisheye lens too because there is more of an oval look when printed. Sometimes I notice that wide angle lenses can make natural shapes of things be distorted. My dad uses a wide angle lens all the time and sometimes we create funny images wear my legs are really long and not normal. (It's fun!) A telephoto Zoom lens allows you to rotate the lens on the body without moving closer to the image. You still keep that the crisp clean look, while taking an easier photo.
In photography, exposure is the total amount of light allowed to fall on the photographic medium during the process of taking a photograph. In other words, the lens know not to bring in too much light, of else the picture will be over exposed. Too much light is not appalling to the eyes. The purpose of exposure adjustment is to control the amount of light from the subject that is allowed to fall on the lens so that it looks correct.
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