What does camera focusing mean?

Question 1: What is the camera focus? The focus is the place where the object is refracted by the convex mirror of the lens and converges into a similar point opposite to the direction of the lens, which is called the focus. In fact, it is not the focus, but the refracted image of the object is relatively small, and the vertical plane of this point can be called the focal plane. Refracted rays are clearest only when they converge on the plane where the focus is located.

Generally, the position of CCD or film is the position of focal plane. In order to shoot clearly, it is necessary to make the focal plane of CCD or film coincide with the refracted object, and the process of making the focal plane coincide is the process of adjusting the focal length.

Generally, only the lens of a SLR camera has an independent focus ring. It can be divided into auto focus and manual focus modes:

1. If any one of the digital camera and lens has a driving motor, then the automatic focusing can be realized through the electronic focusing system of the camera. Set the lens of the camera to autofocus, usually "A", aim the focusing instruction of the lens at the subject, and then press the shutter button halfway to autofocus.

2. If there is something wrong with the lens or motor of the camera, or if it can't focus automatically, you need to focus manually. Set the lens of the camera to "M" manual mode, and then focus by rotating the focus ring on the lens.

Question 2: What does focusing mean in a camera? Focus is focus.

Question 3: Focus in camera photography is a popular explanation of focus, that is, choosing the point with the clearest imaging.

For example, in a scene, some objects are far away from the lens and some objects are close to the lens. Choosing the focus is to choose which object to shoot clearly.

For example, people see things. When you look at the computer screen, the focus of your eyes is on the computer screen. What is behind the computer is seen by Yu Guang, so it is not clear. This is the so-called Jiao Wai. When you look out of the window, the focus is on the object you are looking at outside the window, and the computer that Yu Guang looks at is blurred.

The focal point in photography refers to the focal point, and the optical focal point refers to the convergence point of parallel rays refracted by a lens or reflected by a curved mirror. These two meanings are different.

Question 4: What is a fixed-focus camera? It is a camera that is clear from 1 m (possibly other values) to infinity.

No focusing mechanism, saving cost. This is the lowest camera.

Question 5: How does the camera set multi-focus? 1, you can select "autofocus selection mode", and the camera will automatically select the focus.

2. You can also select "Manual Focus Selection Mode" to control the focus yourself. At this time, it depends on whether the two subjects you shot are not in a focal plane. If it is (such as two people standing side by side), you can ensure that both themes are clear as long as you focus on a certain theme casually; If not (such as two people standing in tandem), you can only choose one subject that you think needs to be clear to focus on, and the other is not so clear.

Question 6: What is the key point in photography? Concentrate on one point, this part is the clearest part.

Question 7: What does the focal length of 35mm in the camera mean? If you say 35mm focal length, you mean 35mm focal length.

The focal length is the distance from the main point on the back of the lens to the CCD plane when the camera focuses at infinity. The CCD of a general digital camera is obviously much smaller than the standard 35mm film, so the actual focal length of a digital camera is usually very small. For example, the actual focal length of Kodak DC5000 is only 6.5- 13mm. However, in order to make it easier for buyers to have a unified concept of the focal length of digital cameras, most camera factories will do parallel calculation of the focal length of digital cameras according to the specifications of 35mm cameras when formulating their specifications, which is called' 35mm equivalent'. When you see this data and compare it with the traditional lens focal length table in the appendix, you can have a general understanding of the lens performance of this digital camera. Reference example Kodak DC5000 digital camera lens marking: 30-60 mm (equivalent to. )

1. Less than 20mm = super wide angle.

2.24 mm -35 mm = wide angle

3.50 mm = normal viewing angle (approximately equal to the viewing angle of your eyes).

4.80mm-300mm = telescopic

Above 5.300mm = super-telescopic.

So your 35mm focal length belongs to wide angle.

Question 8: What does focusing mean in photography? What's the use? Thank you. Focusing means adjusting the focal length. First of all, we must understand what is the point. For the human eye, the focus is the point you stare at, and the images before and after this point are the clearest. The lens of the camera is the same as this. Secondly, the focal length refers to the distance from the focal point to the lens. So the meaning of focus is clear, and its purpose is to make the object you want to express as clear as possible.

When you press the shutter halfway, the camera will automatically focus on a preset point (such as the middle of the picture), which is called autofocus.

Generally speaking, holding down the shutter for half a time is autofocus locking.

The function of autofocus lock is to lock the focus of autofocus and facilitate composition.

For example, the autofocus preset point of my camera is in the middle of the picture, and I want to shoot a flower, and this flower needs to be placed on the left side of the picture to achieve my shooting purpose. At this time, I can first put the flower in the middle of the picture and press the shutter for autofocus. After focusing, I can hold down the shutter for half a minute to lock the focus. Then I turn the camera slightly, put the flowers on the left side of the picture and press the shutter, and the work is finished.

If the camera has manual focusing function, just switch to manual focusing mode. Some cameras don't have this function.

The method of manual focusing to obtain clear focus can refer to the following steps: adjust the focal length in one direction (for example, from near to far), at this time, the subject will become clearer and clearer, and continue to adjust until the subject becomes blurred again after a certain point, and then slowly adjust it in the opposite direction, so that clear focus can be obtained by reciprocating several times.

Question 9: SLR camera focus 9 has 13. What does this mean? This is the number of focal points.

However, in fact, the most accurate and fastest focusing is cross focusing or double cross focusing.

So some cameras will mark 9 o'clock focus, center 1 cross focus, such as Canon 6D, and 19 cross focus, such as 7D.

There is a focus of 39 points and a cross focus of 9 points. Such as Nikon D7000.

Question10: What does Al mean by focusing on Canon cameras? AI focus.

This mode can judge the state of the subject and automatically switch between "single autofocus" and "artificial intelligence servo autofocus". After a single autofocus, if the subject moves, the camera will automatically switch to artificial intelligence servo autofocus to track the subject for focusing.