拍照机结构(国外英文资料).docVIP

照相机构造(国外英文资料) photography Camera structure The camera structure is mainly divided into: aperture, shutter and lens. A, the aperture The aperture is a device that is composed of several overlapping metal blades in the middle of the lens. The first function of the aperture is to regulate the amount of light. The aperture can be large enough to shrink. When shooting the same image, when the light is strong, the aperture should be reduced and the light should be large. The second effect is to change the depth of the field. The larger the aperture, the smaller the field, the smaller the aperture, the greater the depth of the field. Graph: the size of different aperture. 2, aperture coefficient The F factor is the size of the aperture, the ratio of the focal length to the diameter of the aperture. For example: F2.8, F4, f5, F8, F11, F16, F22, etc. Each coefficient is a class of aperture. The larger the aperture, the smaller the aperture, the smaller the light. Conversely, the smaller the aperture coefficient, the larger the aperture, the larger the light. In the above aperture class, the F2.8 is the largest, the F22 is the smallest, and the aperture of the front aperture is twice the amount of light in the back. For example, F2.8 is twice as light as F4, and F4 has twice as much light as F5.6, and so on. Second, the shutter The shutter is a device that controls the duration of the light exposure. The camera usually has a series of markings on the shutter speed dial: 1, 2, 4, 8, 15, 30, 60, 125, 250, 500, 1000, 2000, B, etc. Their actual value is the inverse of the nominal value. 1, 1/2, 1/4, 1/8, 1/15, 1/30, 1/60, 1/125... It is. If the other colors are marked 2, 4, and 8 in other colors between B and 1, they represent the whole second. 1, 2, 4, 8, 1 second, 2 seconds, 4 seconds, 8 seconds. Mirror shutter release B gate, commonly known as the slow gate, is used for long exposure. Normally, press the shutter button to open and close the shutter button. Use B door to have