What does focusing mean in photography? What is it for?

The scientific name of focus in English is focus, and usually digital cameras have a variety of focusing methods, namely autofocus, manual focus, and multi-focus methods. Autofocus: Conventional cameras use a method similar to visual ranging to achieve autofocus, the camera emits a kind of infrared (or other rays), determines the distance of the subject according to the reflection of the subject, and then adjusts the lens combination according to the measured results to achieve autofocus.

This method of autofocus – direct, fast, easy to implement, and low cost – but sometimes it can be wrong (autofocus is not possible when there is something else between the camera and the subject, such as glass, or in low light), and is not very accurate, and is generally not used in today's high-end cameras. Because the camera actively emits rays, it is called active, and because it is actually only a distance measurement, and does not judge whether it is correctly focused through the actual imaging of the lens, it is also called non-TTL type. Compared with active autofocus, this focusing method later developed passive autofocus, that is, judging whether it is correctly focused according to the actual imaging of the lens, and the basis for judging is generally contrast detection, and the specific principle is quite complex.

Because this method is achieved by lens imaging, it is called TTL autofocus. Because this autofocus method is based on lens imaging, it has high focusing accuracy and a low error rate, but it is technically complex, slower (except for advanced autofocus lenses with ultrasonic motors), and high cost. Manual Focus:

Manual focusing, it is a way of focusing by manually turning the focus ring to adjust the camera lens to make the shooting clear, which largely depends on the human eye's judgment of the image on the focusing screen and the proficiency of the photographer and even the photographer's vision. Early SLR cameras and rangefinder cameras basically used manual focus to complete the focusing operation. Today's quasi-professional and professional digital cameras, as well as DSLR digital cameras, are equipped with manual focus function to meet different shooting needs.

Multi-focus: Many digital cameras have multi-point focus, or zone focus. When the focus center is not set at the ** center, you can use multi-point focus, or multi-focus.

In addition to setting the position of the focus point, you can also set the focus range, so that users can shoot different effects**. Common multi-point focuses are 5-point, 7-point, and 9-point focus. Hologram AF Hologram AF, a unique feature of Sony digital cameras, is also a new autofocus optical system, using advanced laser holographic photography technology, using laser points to detect the edge of the subject, even in a dark environment can shoot accurate focus**, effective shooting distance up to meters. Satisfied.

If the camera has a manual focus function, it can be adjusted to the manual focus mode, which is not available on some cameras. If you want to get a clear focus method for manual focus, you can refer to the following steps: adjust the focus in one direction (such as from near to far), then the subject will become clearer and clearer, and continue to adjust until after a certain point, the subject begins to blur a little more, then slowly adjust it in the opposite direction, so that you can get a clear focus after a few reciprocating times.

The word for focus is explained as: 對Focus duìjiāo. (1) Adjusting the focus distance when using the camera.

The word for focus is explained as: 對Focus duìjiāo. (1) Adjusting the focus distance when using the camera.

Pinyin is: duìjiāo. The phonetic pronunciation is:

One. The structure is: pair (left and right structure) focal (upper and lower structure).

What is the specific explanation of focus, we will introduce it to you through the following aspects:

1. Chinese dictionary [click here to view the details of the plan].

Align the focus. For example, remember to focus on the monocular camera, otherwise the photos taken will be blurry. 」

2. Network Explanation.

Focus refers to adjusting the focus distance when using the camera, the English scientific name is focus, usually digital cameras have a variety of focusing methods, namely autofocus, manual focus and multi-focus methods. Focusing is also called light and focusing. Focusing is the process of changing the distance between the objects and the positions of the distance between them through the camera focusing mechanism, so that the image of the object is clear.

Verses about focus.

Near the Jiaoxian Cave, near the Jiaoxian Cave.

Idioms about focusing.

Near the fire, the first scorched head, scorched forehead, scorched denomination, scorched gold flowstone, scorched lips, dry lungs, dry mouth, scorched tongue, scorched forehead, scorched sand, scorched stone, air-to-air, anxious heart.

Words about focus.

Dry mouth, scorched tongue, scorched lips, dry lungs, scorched heart, scorched forehead, scorched yellow sky, scorched sun, scorched head, scorched forehead, sorry, scorched sand and rocks.

Sentence formation about focus.

1. Chongqing drivers have recently circulated a saying that picking out the small reflective white dot behind the first letter of the license plate can make the electronic eye unable to focus, and it is impossible to shoot the license plate number.

2. But you need to keep in mind that slow focusing speeds are always noticeable in low-light conditions.

3. He likes to lead out the real narrative subject in the way of introduction, so Hong Sang-so often focuses on passers-by or irrelevant places in the scene, or pans the camera or waits for the actors to enter the camera.

4. The shooting angle is almost too tilted to be used, but the back of the Hellcat is going in and out of the focusing area, and Max thinks that there may be a chance.

5. Salicylic acid had no inhibitory effect on the growth of pyrowi mycelium, and had no significant effect on spore germination.