How does SLR quickly determine the aperture, shutter, iso, exposure compensation and other values needed for a scene?

1. The simple method to quickly determine the parameters is to refer to the exposure ruler, which is also the main reference standard for M-gear (full manual gear);

2. The exposure scale of SLR is under the viewfinder. The exposure scale is a horizontal straight line (there is also a camera on the left or right of the viewfinder, and there is also a vertical straight line) with scales on it. The middle is 0, and the left and right are negative and positive respectively, increasing or decreasing the small space of 1/3 (that is, exposure difference 1/3). The exposure scale point is the standard exposure with a scale of 0. The farther to the left of the ruler, the darker the picture (underexposed), and the farther to the right, the brighter the picture (overexposed).

3. Digital ISO is the amplification degree and brightness of charge signal (unlike film, film sensitivity is the reaction speed of silver salt particles). The lower the ISO, the smaller the magnification and the purer the image. The higher the ISO, the more obvious the noise (noise is amplified synchronously) and the worse the image quality. Novices can set ISO to automatic. If there are general requirements for image quality, the automatic upper limit of Quan Huafu can be set to 6400, and the automatic upper limit of half frame is 1600. If there are higher requirements for image quality, the ISO upper limit will be lowered accordingly. When content is more important than image quality, you can climb ISO.

4. Aperture controls depth of field and light. The larger the aperture, the shallower the depth of field and the greater the amount of light entering. The aperture should be set according to the subject matter of shooting. When the depth of field needs to be controlled, the aperture setting is the first. Digital cameras (including SLR) have aperture priority mode (A or AV), the photographer sets the aperture, and other parameters are generated by the camera. If it is full manual mode, after setting the aperture, adjust the shutter speed with the pulsator until the exposure scale in the viewfinder is centered (standard exposure), and there is no need to remember parameters;

5. The shutter controls the light time. The higher the shutter, the shorter the lighting time, the stronger the ability to capture the moment and the stronger the dynamic effect. When shooting a dynamic picture or a freeze-frame moment picture, the shutter setting is the first. Digital cameras have shutter priority mode (S or TV), the photographer sets the shutter, and other parameters are generated by the camera. If it is in full manual mode, after setting the shutter, adjust the aperture value with the impeller until the exposure scale in the viewfinder is centered; When the aperture can no longer be adjusted (or you don't want to adjust it), you can adjust ISO to break through the automatic limit and even use extended sensitivity.

6. Exposure compensation is widely used in aperture priority or shutter priority mode. The general principle is to add white and subtract black, that is, when the focus is on the dark part of the picture, it is compensated, and vice versa, but this is not fixed. You don't have to use M file (some cameras don't use M file). In general, the photographer will get more compensation. In non-serious photography, exposure compensation can be ignored as long as it is not in an environment with very large light ratio.

7. In short, when controlling the depth of field, first determine the aperture value, and then adjust the shutter. The adjustment range reference is the center of the exposure scale. When dynamic is needed, first determine the shutter value, then adjust the aperture, and adjust the amplitude reference in the center with the exposure ruler. Of course, the center of the exposure scale is the reference of standard exposure, and the exposure scale can also be left (dark tone) or right (light tone). In addition, histogram is also a reference for correct exposure, but histogram is not as intuitive as exposure scale. Usually, standard exposure does not need to use M-block, which is tedious and meaningless. Only in the case of personalized exposure (creating your own unique style), you need to use M-block;

8. When you need to capture the picture that appears instantly, use the automatic file (P file or fully automatic auto file. The difference between P gear and automatic gear is that P gear can control ISO, while automatic gear is not controlled manually. At this time, it is too late to adjust the parameters.