af和af-s_什么是正式AF？

一时失言乱红尘 2023-03-05 08:29 16阅读 0赞

af和af-s

## AF：自动对焦 **(**AF: Autofocus**)** ##

**AF is an abbreviation of "Autofocus"**.

**AF是“自动对焦”的缩写** 。

It is an optical system, which makes use of a sensor, a control system and a motor to put a focus on an automatically or manually chosen spot or region. An electronic rangefinder has a display as an alternative of the motor; the process of adjustment of the optical system has to be carried out manually until indication. Autofocus techniques are well-known by their category as being one of the three given following:

它是一个光学系统，它利用传感器，控制系统和电动机将焦点放在自动或手动选择的点或区域上。 电子测距仪具有显示器作为电动机的替代品。 光学系统的调整过程必须手动进行，直到显示出来。 自动对焦技术在其类别中众所周知，是以下三种技术之一：

*  Active variants
    
    有效变体
 *  Passive variants
    
    被动变体
 *  Hybrid variants
    
    混合变体

**Autofocus systems** depend on one or more sensors to find out the correct focus. Several **AF** systems depend on a single sensor, at the same time as others use a range of sensors. The majority of current SLR cameras use through-the-lens optical sensors, with a split sensor array offering light metering, even though the latter can be programmed to designate as very important it's metering to a similar spot as one or more of the **AF** sensors.

**自动对焦系统**依靠一个或多个传感器来找出正确的焦点。 几个**自动对焦**系统依赖一个传感器，而其他**自动对焦**系统则同时使用多个传感器。 当前的大多数单反相机都使用镜头直通光学传感器，而分体式传感器阵列可以提供测光功能，即使后者可以被编程为将测光指定为与一个或多个**AF**传感器相似的点非常重要。 。

*  Optical autofocusing is now frequently speedier and highly accurate than can be accomplished manually with a normal viewfinder through the lens, even though highly accurate manual focus can be accomplished with exceptional accessories such as focusing magnifiers.
    
    与通常的取景器通过镜头手动完成光学自动对焦相比，现在光学自动对焦通常更快速，更准确，即使使用特殊的附件(例如聚焦放大镜)也可以实现高度精确的手动对焦。
 *  Autofocus accurateness within 1/3 of the depth of field (DOF) at the widest aperture of the lens is ordinary in professional AF SLR cameras.
    
    在专业AF SLR相机中，镜头最宽光圈下自动对焦精度在景深(DOF)的1/3以内。
 *  The majority of multi-sensor AF cameras enable manual selection of the active sensor, and a lot of provides automatic selection of the sensor by using algorithms that attempt to acquaint with the difference in the location of the subject.
    
    大多数多传感器AF摄像机都可以手动选择主动传感器，并且很多摄像机都通过使用尝试了解被摄体位置差异的算法来自动选择传感器。
 *  Several AF cameras can perceive whether the subject is moving towards or away from the camera, comprising speed and acceleration data, and keep the focus on the subject — a function used primarily in sports and other action photography; on Canon cameras, this is known as AI servo, whereas on Nikon cameras it is known as "continuous focus".
    
    多个AF相机可以感知对象是否朝相机移动或移动，包括速度和加速度数据，并保持对对象的聚焦-该功能主要用于运动和其他动作摄影； 在佳能相机上，这被称为AI伺服，而在尼康相机上，这被称为“连续对焦”。
 *  The data accumulated from AF sensors are used to have management control over an electromechanical system that adjusts the focus of the optical system.
    
    从AF传感器累积的数据用于对机电系统进行管理控制，该机电系统可调整光学系统的焦点。
 *  A modification of autofocus is an electronic rangefinder, a system in which focus data are made available to the operator, other than the adjustment of the optical system is still carried out manually.
    
    自动聚焦的一种改进是电子测距仪，该系统中的聚焦数据可供操作员使用，而不是光学系统的调节，仍然是手动执行的。
 *  The speed of the AF system is extremely dependent on the widest aperture provided by the lens at the present focal length.
    
    自动对焦系统的速度在很大程度上取决于镜头在当前焦距下提供的最大光圈。

Reference: [Autofocus][]

参考： [自动对焦][Autofocus]

> 翻译自: [https://www.includehelp.com/dictionary/af-full-form.aspx][https_www.includehelp.com_dictionary_af-full-form.aspx]

af和af-s

[Autofocus]: https://en.wikipedia.org/wiki/Autofocus
[https_www.includehelp.com_dictionary_af-full-form.aspx]: https://www.includehelp.com/dictionary/af-full-form.aspx