Overview
Depth of field refers to the range of object distances measured along the axis of the imaging depth camera that can take a clear image in front of a camera lens or other imager. After the focusing is completed, a clear image can be formed within the range before and after the focus. This distance between the front and back is called the depth of field. There is a certain length of space in front of the lens (before and after the focus adjustment). When the subject is in this space, the imaging on the film is between the two converging circles before and after the focus. The length of the space in which the subject is located is called the depth of field. In other words, the ambiguity of the subject in this space, which is present on the film surface, is within the allowable circle of the confusion circle. The length of this space is the depth of field.
Three elements
The distance between the aperture, the lens, and the subject matter is an important factor affecting the depth of field:
1. The larger the aperture (the smaller the aperture value f), the shallower the depth of field, the smaller the aperture (the larger the aperture value f), the deeper the depth of field.
2. The longer the lens focal length, the shallower the depth of field, and the deeper the depth of field.
3. The closer the subject is, the shallower the depth of field is, and the farther the subject is, the deeper the depth of field is.
Depth of field calculation formula: see diagram
From the formula, we can see that the depth of field is deep.
From the depth calculation formula, it can be seen that the depth of field is related to the lens aperture, lens focal length, shooting distance, and image quality requirements (shown as the size of the allowable circle of confusion). The influence of these major factors on the depth of field is as follows (assuming other conditions do not change):
1, lens aperture:
The larger the aperture, the shallower the depth of field; the smaller the aperture, the deeper the depth of field.
2, the lens focal length The longer the focal length of the lens, the shallower the depth of field; the shorter the focal length, the deeper the depth of field;
3, the farther the shooting distance, the deeper the depth of field; the closer the distance, the shallower the depth of field.
When shooting, the process of adjusting the camera lens to clearly image the scene at a distance from the camera is called focusing. The point where the scene is located is called the focus point, because “clearness†is not an absolute concept, so The image of the scene in front of the focus (near the camera) and within a certain distance from the back can be clear. The sum of the front and rear ranges is called the depth of field, meaning that as long as the scene is within this range, it can be clearly photographed. The depth of field, first of all, is related to the focal length of the lens. A lens with a long focal length, a small depth of field, and a short focal length have a large depth of field. Secondly, the depth of field is related to the aperture. The smaller the aperture is (the larger the value is, for example, the aperture of f16 is smaller than the aperture of f11), the greater the depth of field; the larger the aperture (the smaller the value, the aperture of f2.8 is larger than f5.6). The smaller the depth of field is. Secondly, the foreground depth is less than the depth of field, that is to say, after precise focusing, the scene in front of the focus point can be clearly imaged only for a short distance, and the scene behind the focus point for a long distance is clear.
The depth of space that can be clearly seen at the same time is called the depth of the imaging space of the eye, which is the depth of field.
Influencing factors
1, the lens focal length 2, the distance of the subject 3, the size of the aperture 4, the size of the photosensitive element (related to the allowable circle of confusion circle)
relationship
1. The greater the aperture, the smaller the depth of field, and the smaller the aperture, the greater the depth of field.
2. The longer the lens focal length, the smaller the depth of field, and vice versa.
3. The closer the subject is, the smaller the depth of field is, and the farther the subject is, the greater the depth of field is.
Depth of field refers to the range of object distances measured along the axis of the imaging depth camera that can take a clear image in front of a camera lens or other imager. After the focusing is completed, a clear image can be formed within the range before and after the focus. This distance between the front and back is called the depth of field. There is a certain length of space in front of the lens (before and after the focus adjustment). When the subject is in this space, the imaging on the film is between the two converging circles before and after the focus. The length of the space in which the subject is located is called the depth of field. In other words, the ambiguity of the subject in this space, which is present on the film surface, is within the allowable circle of the confusion circle. The length of this space is the depth of field.
Three elements
The distance between the aperture, the lens, and the subject matter is an important factor affecting the depth of field:
1. The larger the aperture (the smaller the aperture value f), the shallower the depth of field, the smaller the aperture (the larger the aperture value f), the deeper the depth of field.
2. The longer the lens focal length, the shallower the depth of field, and the deeper the depth of field.
3. The closer the subject is, the shallower the depth of field is, and the farther the subject is, the deeper the depth of field is.
Depth of field calculation formula: see diagram
From the formula, we can see that the depth of field is deep.
From the depth calculation formula, it can be seen that the depth of field is related to the lens aperture, lens focal length, shooting distance, and image quality requirements (shown as the size of the allowable circle of confusion). The influence of these major factors on the depth of field is as follows (assuming other conditions do not change):
1, lens aperture:
The larger the aperture, the shallower the depth of field; the smaller the aperture, the deeper the depth of field.
2, the lens focal length The longer the focal length of the lens, the shallower the depth of field; the shorter the focal length, the deeper the depth of field;
3, the farther the shooting distance, the deeper the depth of field; the closer the distance, the shallower the depth of field.
When shooting, the process of adjusting the camera lens to clearly image the scene at a distance from the camera is called focusing. The point where the scene is located is called the focus point, because “clearness†is not an absolute concept, so The image of the scene in front of the focus (near the camera) and within a certain distance from the back can be clear. The sum of the front and rear ranges is called the depth of field, meaning that as long as the scene is within this range, it can be clearly photographed. The depth of field, first of all, is related to the focal length of the lens. A lens with a long focal length, a small depth of field, and a short focal length have a large depth of field. Secondly, the depth of field is related to the aperture. The smaller the aperture is (the larger the value is, for example, the aperture of f16 is smaller than the aperture of f11), the greater the depth of field; the larger the aperture (the smaller the value, the aperture of f2.8 is larger than f5.6). The smaller the depth of field is. Secondly, the foreground depth is less than the depth of field, that is to say, after precise focusing, the scene in front of the focus point can be clearly imaged only for a short distance, and the scene behind the focus point for a long distance is clear.
The depth of space that can be clearly seen at the same time is called the depth of the imaging space of the eye, which is the depth of field.
Influencing factors
1, the lens focal length 2, the distance of the subject 3, the size of the aperture 4, the size of the photosensitive element (related to the allowable circle of confusion circle)
relationship
1. The greater the aperture, the smaller the depth of field, and the smaller the aperture, the greater the depth of field.
2. The longer the lens focal length, the smaller the depth of field, and vice versa.
3. The closer the subject is, the smaller the depth of field is, and the farther the subject is, the greater the depth of field is.
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