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DSLRs and mirrorless cameras have a lot of buttons. If you’re just starting to get the hang of manually controlling your camera, you’re probably wondering what all the—seemingly non-essential—ones do. Let’s take a look at the AE-L, AF-L, AF-ON, and * buttons.

單反相機和無反光鏡相機有很多按鈕。 如果您剛開始掌握手動控制攝像機的功能，那么您可能想知道所有這些(看似不必要的)功能都在做什么。 讓我們看一下AE-L，AF-L，AF-ON和*按鈕。

AE-L或*按鈕 (The AE-L or * Buttons)

The AE-L and * buttons are the same. It’s just that Nikon and Sony use AE-L and Canon, inexplicably, uses the asterisk symbol. The AE stands for “Automatic Exposure,” and the L stands for “Lock.” In other words, when you press it, whatever exposure settings your camera currently has selected are locked until you take a picture or release the shutter button fully.

AE-L和*按鈕相同。 只是尼康和索尼使用AE-L，而佳能則使用星號符號。 AE代表“自動曝光”，L代表“鎖定”。 換句話說，當您按下它時，相機當前選擇的任何曝光設置都會被鎖定，直到您拍攝照片或完全釋放快門按鈕為止。

This is incredibly useful if you’re working in one of the semi-manual modes like Aperture Priority or Shutter Speed priority. For example, if you’re trying to take a silhouette photo or working in a tricky lighting situation. Here’s what to do:

如果您在半手動模式(例如光圈優先或快門速度優先)中的一種下工作，這將非常有用。 例如，如果您要拍攝剪影照片或在光線不佳的情況下工作。 這是做什么的：

• Select whatever metering mode you think will work best.

  選擇您認為最有效的任何測光模式。

• Half-press the shutter button to start your camera’s meter.
  半按快門按鈕以啟動相機的測光。
• Focus your camera on whatever object in the scene will give you the exposure you want. If you’re shooting a silhouette, meter off the bright background if you want your subject well exposed despite a bright backlight, meter off their face, and so on.
  將相機對準場景中的任何物體，即可獲得所需的曝光。 如果要拍攝剪影，請在明亮的背光下測光明亮的背景，并在測光的情況下測光。
• Hold the AE-L button (Nikon) or press the * button (Canon) to lock the exposure settings. Keep your finger half-pressed on the shutter button.
  按住AE-L按鈕(Nikon)或按*按鈕(Canon)鎖定曝光設置。 保持半按快門按鈕。
• Recompose the image how you want; the exposure settings won’t change. Press the shutter button fully to take the photo.
  根據需要重新構圖； 曝光設置不會改變。 完全按下快門按鈕拍攝照片。

If you don’t want to go fully manual, the AE-Lock button is a really handy tool to use.

如果您不想完全手動操作，可以使用AE鎖定按鈕。

AF-L按鈕 (The AF-L Button)

Some cameras also have an AF-L button or the AE-L button may also double as one. The AF stands for “Auto Focus;” the L still stands for “Lock.”

某些相機還具有AF-L按鈕，或者AE-L按鈕也可能加倍。 AF代表“自動對焦”。 L仍然代表“鎖定”。

Pressing the AF-Lock button locks the autofocus to where it’s currently set. This is useful for situations where you want to focus on a particular subject, but there isn’t an autofocus point where you need it.

按AF鎖定按鈕可將自動對焦鎖定到當前設置的位置。 這在您要聚焦于特定主題但沒有自動聚焦點的情況下很有用。

The reason most cameras don’t have an AF-lock button, however, is that the shutter button doubles as one when you’re in Single Autofocus mode. Once you half-press the shutter button and it finds focus, it stays locked. The AF-lock button, then, is only useful if you’re using Continuous or Hybrid autofocus modes.

但是，大多數相機沒有AF鎖定按鈕的原因是，在單次自動對焦模式下，快門按鈕會加倍。 半按快門按鈕找到焦點后，它將保持鎖定狀態。 然后，僅當您使用連續或混合自動對焦模式時，AF鎖定按鈕才有用。

AF-ON按鈕 (The AF-ON Button)

The AF-ON button does the opposite to the AF-L button: it turns autofocus on. This is used by a lot of professionals with a technique called “back button autofocusing.”

AF-ON按鈕的作用與AF-L按鈕相反：它打開自動對焦。 許多專業人員都使用這種技術，稱為“后退按鈕自動對焦”。

Back button autofocusing involves setting your camera up so that the shutter button no longer controls autofocus. Instead, autofocus is only activated when you hold the AF-ON button on the back of the camera. This gives you much more control over how autofocus behaves—although it makes your camera slightly fiddlier to use.

后退按鈕自動對焦涉及設置相機，以便快門按鈕不再控制自動對焦。 取而代之的是，只有在按住相機背面的AF-ON按鈕時才會激活自動對焦。 這使您可以更好地控制自動對焦的行為，盡管這會使您的相機使用起來更加靈活。

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The automatic exposure lock, autofocus lock, and AF-ON buttons all give you a level of manual control over your camera’s automatic functions. If you want to master your camera, you need to know how to use them.

自動曝光鎖定，自動對焦鎖定和AF-ON按鈕都使您可以對相機的自動功能進行一定程度的手動控制。 如果您想精通相機，則需要知道如何使用它們。

How exactly they behave can normally be changed in your camera’s settings. For example, you can change the behavior of Nikon’s AE-L/AF-L button so that it locks both focus and exposure (the default), just focus, or just exposure.

通常，可以在相機的設置中更改它們的行為。 例如，您可以更改尼康的AE-L / AF-L按鈕的行為，以使其同時鎖定焦點和曝光(默認)，僅鎖定焦點或僅鎖定曝光。

翻譯自: https://www.howtogeek.com/396561/what-are-the-ae-l-af-l-and-buttons-and-what-do-they-do/

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