Depth of field refers to the range of front and back distances of the object measured by imaging that can obtain a clear image at the leading edge 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.
Overview <br> <br> so-called depth, when the focal length is aligned with a certain point, it is still clear both before and after the range. It can decide whether to blur the background to highlight the subject or shoot a clear background. We can often see photographs of flowers, insects, etc., and blur the background (called a small depth of field). However, photographs such as commemorative or group photographs, landscapes, etc., are generally taken as clear as the subject (called depth of field).
Explained in detail: When the camera's lens is focused on a certain object, the point in the center of the lens at the same plane of the vertical axis of the lens can be a very clear image on the film or receiver, in the plane along the lens A certain range of points in front of and behind the axis can also form a clearer image point acceptable to the eye. The distance between the front and the back of the scene in this plane is called the camera's depth of field.
When the light with parallel optical axis is injected into the convex lens, the ideal lens should be that all the light rays gather at one point and then spread out in a cone shape. This point that gathers all the light rays is called the focal point.
Before and after the focus, the light began to gather and spread, and the image of the point became blurred, forming an enlarged circle. This circle was called a disperse circle.
In reality, viewing images is viewed in a certain way (such as projection, magnification into photos, etc.), and the image perceived by human eyes has a great relationship with magnification, projection distance and viewing distance. The diameter of the disperse circle is larger than the discriminating ability of the human eye, and the blur produced by the actual image within a certain range is indistinguishable. This indistinguishable circle of confusion is called the permissible circle of confusion. There is a tolerance circle around the front and back of the focus.
Based on the camera photographer, the distance from the focal point to the vicinity to allow a circle is called deep, and the distance from the focal point to the distance to allow a circle is called the depth of field.
The distance between the aperture, the lens, and the subject matter is an important factor that affects 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.
(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 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.
Overview <br> <br> so-called depth, when the focal length is aligned with a certain point, it is still clear both before and after the range. It can decide whether to blur the background to highlight the subject or shoot a clear background. We can often see photographs of flowers, insects, etc., and blur the background (called a small depth of field). However, photographs such as commemorative or group photographs, landscapes, etc., are generally taken as clear as the subject (called depth of field).
Explained in detail: When the camera's lens is focused on a certain object, the point in the center of the lens at the same plane of the vertical axis of the lens can be a very clear image on the film or receiver, in the plane along the lens A certain range of points in front of and behind the axis can also form a clearer image point acceptable to the eye. The distance between the front and the back of the scene in this plane is called the camera's depth of field.
When the light with parallel optical axis is injected into the convex lens, the ideal lens should be that all the light rays gather at one point and then spread out in a cone shape. This point that gathers all the light rays is called the focal point.
Before and after the focus, the light began to gather and spread, and the image of the point became blurred, forming an enlarged circle. This circle was called a disperse circle.
In reality, viewing images is viewed in a certain way (such as projection, magnification into photos, etc.), and the image perceived by human eyes has a great relationship with magnification, projection distance and viewing distance. The diameter of the disperse circle is larger than the discriminating ability of the human eye, and the blur produced by the actual image within a certain range is indistinguishable. This indistinguishable circle of confusion is called the permissible circle of confusion. There is a tolerance circle around the front and back of the focus.
Based on the camera photographer, the distance from the focal point to the vicinity to allow a circle is called deep, and the distance from the focal point to the distance to allow a circle is called the depth of field.
The distance between the aperture, the lens, and the subject matter is an important factor that affects 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.
(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 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.
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