How to correctly and reasonably carry out exposure photography exposure? What skills are introduced in detail?

How to correctly and reasonably expose?

The physical meaning of exposure means that light forms a latent image on the photosensitive layer (coated with photochemical substances). The process after exposure is chemical development, which makes the latent image appear and solidify. Many devices in industry apply the exposure principle to transfer graphic signals to the required materials.

Next, let's take a look at the sharing of photography exposure skills.

Introduction of basic parameters

1, aperture Aperture is not only the name of the camera hardware structure, but also an important setting parameter in the camera. As the name implies, the aperture is a circular baffle that controls the passage of light. The principle is actually very simple, that is, controlling the size of the light channel to control the amount of light entering. Aperture affects the depth of field of the picture.

2. shutter. The shutter mentioned here refers to the mechanical shutter, which is also one of the important parts of the camera. Similar to the aperture, it is used to control the amount of light entering, but the difference is that the shutter controls the light throughput by controlling the length of light passing time.

3. sensitive. Different from hard parameters such as aperture shutter, ISO sensitivity setting belongs to camera soft parameters. The level of ISO sensitivity means that when the exposure value of the same EV is the same, you can choose a higher ISO sensitivity and use a faster shutter speed to get the same exposure. But if the ISO is too high, it will aggravate the graininess of the picture and affect the purity.

4, metering mode. General camera metering modes are mainly divided into spot metering, average metering and central key metering. Different metering modes should be selected for different scenes to achieve more accurate and realistic exposure.

Detailed explanation of actual combat skills

Scene 1: Outdoor scenery. Outdoor landscape photography can be said to be a simple shooting scene. From the perspective of exposure alone, there are not many factors to consider, and the most important thing is the control of depth of field. At this time, a smaller aperture should be used. The usual practice is to select the camera mode dial to position A, and set the aperture value between F8-F 1 1 by adjusting the dial, so that you can have better definition and appropriate depth of field. Let the camera automatically set other exposure parameters.

Scene 2: Indoor portrait. The exposure skills of indoor portraits are more particular. The first thing to ensure is the accuracy of the focus of the characters. Generally, the focus is on the eyes of the characters. Secondly, you can choose the spot metering mode, take the face as the metering point, and use the M-range of the camera to fine-tune the aperture and shutter speed to ensure the correct exposure of the face.

Scene 3: Night view of the city. City night scene is one of the subjects that many people like to shoot, and it is easier to discharge eye-catching effects. Taking shooting shuttle traffic as an example, we should first have a stable triangle glue as the support, turn off the camera's anti-shake function, properly reduce ISO to ensure the purity of the picture, use M file to choose a smaller aperture and a longer exposure time to record the light trajectory, and discharge the dynamic and gorgeous city night scene picture.

Scene 4: Moving portrait. Sports portraits pay attention to the accuracy of focusing and the overall sense of the picture. If you want to take a reasonable exposure shot of a moving portrait and take a dynamic picture, you must first realize that you can use a slower shutter and a larger aperture, and you can't deviate from the main body during the focusing process, that is, the lens should move with the main body until the shutter is completely released. The effect of this is to highlight the main body while blurring the background, which is very dynamic.

Scene 5: Close-up of animals and plants. This kind of theme suggests shooting in soft light environment, then try shooting from multiple angles, and at the same time use large aperture to blur the background to increase the layering of the picture.