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本篇paper代写- Lens focusing讨论了镜头的聚焦。聚焦对拍摄成功的作品十分重要。对摄影者而言，聚焦就是把画面上的趣味点表现得最清晰。要实现这个目的，就必须熟练掌握照镜头的常用聚焦功能。因为聚焦不准确，被拍摄的物体就不可能被清晰生动地表现出来。本篇paper代写由51due代写平台整理，供大家参考阅读。

Focus, also known as focus, is important for successful photography. To a person, "focus" is to focus on the most important point of observation or examination. For a photographer, "focus" is about showing the most interesting points in the picture. In order to achieve this goal, we must master the common focusing function of the camera. Because the focus is not accurate, the object being photographed cannot be clearly and vividly represented.

In order to create high-quality photographic works, we should strive for "accuracy" when focusing, but not be satisfied with "getting by". To be able to focus accurately on different subjects in different environments, we need to be familiar with the characteristics of different ways of focusing and the best application situations. Since the automatic focusing function of camera is enough to meet the requirements of photography in most cases, this paper first discusses several problems about automatic focusing. You can get accurate focus every time you choose the basic techniques described below.

Manual focusing is usually represented by M or MF on cameras, and automatic focusing is represented by AF. Manual/automatic focus switches for single-lens reflex cameras or high-end consumer digital cameras are generally on the lens, with different positions. For example, a single-lens reflex camera with a replaceable lens, the device is usually at the back of the lens.

If the camera is set to automatic focusing mode, when the shutter is half pressed, the camera will be automatically ranging and focusing. After focusing, the focusing indicator will stop flashing. The term "confocal" refers to the success of automatic focusing. If set to manual focus, the focus can be focused by rotating the focus ring on the lens, depending on the clarity of the subject in the viewfinder that needs to be focused.

"Zooming", as the term is often used by film friends, refers to the successful display of focusing in the automatic focusing state of the camera, but the actual focus and predetermined focus are beyond the allowable range. It belongs to the camera system error, not can be controlled by human factors.

The automatic focusing of a camera depends first and foremost on the camera used. Because different cameras have different focusing systems. Nikon's single-lens reflex camera, for example, mostly USES auto-focus, driven by the fuselage's motor. Canon's single-lens reflex camera, on the other hand, mostly adopts automatic focusing mode driven by motors inside the lens.

Some entry-level nikon SLR cameras, such as the D40/D40x, eliminate fuselage-driven auto-focus, reduce production costs and make cameras smaller, but deprive some lenses driven by ordinary motors of auto-focus. However, they can use a lens equipped with an ultrasonic motor to automatically focus.

Early autofocus cameras focused on a small area in the center of the viewfinder. During shooting, the camera's central point should be aimed at the subject, and the composition should be taken after the focus is locked half by the shutter. This is simple, but it can be tricky to shoot with a tripod camera.

Later autofocus cameras gradually expanded the range of autofocus and began adding more focus to the focus screen. Many cameras now add 5 points, 7 points, 9 points, and even 45 pairs of focus to the frame, according to the golden section. The increase of focus can be used to automatically focus objects in the non-central area without moving the camera. Some cameras also combine the focusing system with a multi-area measuring system to reduce the interference of ambient light on the focal point, thus improving the focusing accuracy while obtaining a relatively appropriate exposure.

On the focus selection device of the camera, the words "S", "C" and "M" are written. In addition to "M" means manual focusing, where "S" and "C" are single-pass automatic focusing mode and continuous automatic focusing mode respectively, they are usually written as "af-s" and "af-c" in written expression. It is important to understand their function and to play their role in a specific environment for the successful creation of photographic works.

"S" means "once". This mode is mainly used when photographing stationary objects or portraits. The key points to using this focusing mode are:

First select "S" or "single autofocus" on the camera fuselage. Some cameras have single-pass/continuous autofocus Settings that are set through the menu.

When the shutter is half-pressed during shooting, the camera's internal automatic control system will start the range-focusing instruction of the single-time servo automatic focusing mode, and transmit the relevant data to the electronic and mechanical transmission device of the lens for focusing.

Place the subject or subject in the focus area and press the shutter release.

"C" means "continuous". This mode is an automatic focusing mode that most AF SLR cameras have. It is mainly used for tracking and photographing objects or characters that move continuously, such as people moving rapidly and other objects, birds flying and dynamic insects. When the focusing mode is set in this position, the focusing system of the camera will automatically keep running continuously and be in the working state of looking for the focus at all times. A photographer can track a moving target in the camera's autofocus area. As long as the photographer holds the semi-press of the shutter, the automatic focusing system will always change the focus according to the change of the target distance, and the automatic tracking of the focus will not be finished until the shutter is pressed.

Explanation: under normal circumstances, as long as the shutter of the camera is kept half-click, when it is fully focused, the lens focusing action will stop, and as long as the shutter is not really pressed down, the focus indicator light in the viewfinder will keep on, telling the photographer the specific focus of the picture. In addition, most AF cameras can set the focusing prompt tone. When the focus cue is turned on, the photographer can be prompted when the focus is finished.

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