#单反相机三种自动对焦模式怎么用##长文创作激励计划##头条创作挑战赛#
Answer questions from photographers.
单反相机的三种主要自动对焦模式分别是：单次自动对焦（Single-Shot AF，简称AF-S）、连续自动对焦（Continuous AF，简称AF-C），以及自动伺服对焦（AI Servo AF，尼康中称为AF-C，索尼和佳能中有时也称为AI Focus/AI Servo）。
1、单次自动对焦（AF-S/One Shot）：
Definition: When the shutter is pressed halfway, the camera focus system locks the focus of the subject, and once the focus is complete, the focus does not change even if the subject moves. Suitable for static or slow-moving bodies.
Usage Scenarios:
Portrait Photography: Shoot still portraits of people and make sure the face or eyes are in focus.
Landscape photography: When shooting still scenes such as landscapes and buildings, you can carefully adjust the composition without worrying about focus drift.
Macro photography: Photographing still life or macro details requires precise control of the focus position.
2、连续自动对焦（AF-C/AI Servo）：
Definition: The camera continuously tracks a moving subject, automatically adjusting the focus to keep the subject sharp. Ideal for fast-moving subjects.
Usage Scenarios:
Sports photography: Shoot fast-moving scenes such as athletes, race cars, etc., to ensure that the subject is clear even when moving.
Wildlife photography: Capture the natural behavior of animals, such as running, flying, and other dynamic scenes.
Street Photography: Capture moments in unpredictable environments, such as the dynamic movements of pedestrians.
3、自动伺服对焦（AF-A/AI Focus）：
Definition: The camera automatically switches between single focus and continuous focus based on the movement of the subject, which is suitable for scenes where the subject's state is uncertain.
Usage Scenarios:
Daily capture: When you are not sure whether the subject will move, such as shooting children and pets, this mode can be flexible.
Photojournalism: In a fast-changing news scene, autofocus can quickly respond to scene changes, reducing the risk of missing key moments.
Travel photography: On travel that is fast-moving and requires quick decisions on how to shoot, servo autofocus provides a flexible focusing strategy.
The choice of each focus mode should be decided according to the specific situation of the shooting and the photographer's creative intentions, and the flexible use of it can greatly improve the success rate of the shot and the quality of the work.
In practice, photographers usually need to pre-set the focus mode according to the dynamics of the subject, and quickly switch between them during the shooting process if necessary to adapt to different shooting conditions.