The exposure English name is exposure, the exposure mode is the mode of the computer adopts a natural light source, which is usually divided into a variety, including: shutter priority, aperture priority, manual exposure, AE lock and other modes. The quality of the photo is related to the amount of exposure, that is, the light should make the CCD get a clear image. The exposure amount is related to the light time (shutter speed determination), the light area (aperture size decision).
Shutter and aperture priority:
In order to get the correct exposure, the correct shutter and the aperture are needed. When the shutter is fast, the aperture is large; when the shutter is slow, the aperture is small. The shutter is preferred to calculate the value of the amount of exposure to the machine automatic light system, and then automatically decide how much aperture is automatically decided according to your selected shutter speed. The aperture is preferred to calculate the value of the amount of expansion by the machine automatic light system, and then automatically decides how much shutter according to your selected aperture size. When shooting, the user should combine the actual environment to adjust the exposure and shutter to both the shutter, complement.
The larger the aperture, the more light passed through the unit time, the less it. The general representation of the aperture is the letter "f value", such as F5.6, F4, etc. It should be noted here that the smaller the value, the greater the aperture, such as F4, is larger than the aperture of F5.6, and between two adjacent aperture values, that is, F4 is passed by F5.6. The light is twice as large. Relatively speaking, the definition of the shutter is very simple, that is, the way the light is allowed to pass through the aperture, and the means is a value, such as 1/30 seconds, 1/60 seconds, etc., the same two adjacent shutters are twice.
The combination of the aperture and shutter forms an exposure, and in the case of exposure, this combination is not unique. For example, the currently measured normal exposure combination is f5.6, 1/30 seconds. If the aperture is increased at the first level, the shutter value will be changed to 1/60, such a combination can also achieve normal. The exposure amount. Although different combinations can reach the same exposure, the picture effect being photographed is different.
The shutter is preferred to obtain a diaphragm value by using the camera to measure light in the case of manual defining the shutter. For example, the shutter is prioritized to capture motors, especially in sports shooting. Many friends find that the subjects that are often blurred when shooting moving objects, which is blurred, which is because the speed of the shutter is not fast enough. In this case you can use the shutter priority mode to probably determine a fast door value, and then shoot. Because the shutter is fast, the amount of light in the light may be reduced, the color is shining, which requires increased exposure to enhance the brightness of the picture. The operation of the object is generally regular, then the value of the shutter can also be estimated, such as shooting the pedestrian, the shutter speed only needs 1/125 seconds, and the droplets of shooting are 1/1000 seconds.
Manual exposure mode:
The hand-controlled exposure mode needs to manually complete the adjustment of the aperture and shutter speed each time you shoot, so the benefit is that the photographer is manufacturing different picture effects. If you need pictures of the sports trajectory, you can extend the exposure time, speed up the shutter, the exposure is increased; if you need to make a dull effect, the shutter is accelerated, the exposure is reduced. Although such autonomy is very high, it is very inconvenient, and the time is not allowed for the raging moment.
AE mode:
The AE is called Auto Exposition, which is automatically exposed. The pattern can be divided into aperture priority AE, shutter speed priority AE, program AE, flash AE and depth priority AE. Aperture priority AE is a photoelectric size of the photographer when the photographer is selected, and the camera automatically selects the automatic exposure mode of the shutter time required for the appropriate exposure according to the information of the scene brightness, CCD sensitivity, and human-selected aperture, that is, the aperture manual , Shutter time automatic exposure method. This exposure method is mainly used in a photographing occasion, such as shooting landscape, portrait or macro photography. Multi-point metering:
Multi-point measuring is through the brightness of the scene, through flash compensation, etc., to achieve the best photographic effect, especially suitable for photographing different objects. First, the user wants to measure the scenery of the scene, and then performs the light source object, then performs AE lock; the second step is to measure light, most of the professional or quasi-professional cameras automatically analyze, and use the flash to make a backlight object Falling light.
