Skills of focusing with back keys

Lead: The function of back key focusing is often used by photographers, but we seldom touch it when taking pictures, but using back key focusing can make your focus faster and more accurate. Let's take a look at the skills of using the back key to focus!

What is Back Button Focus?

Half-pressing the shutter can handle most shooting, but in some cases, half-pressing the shutter will become useless. For example, you can easily press the entire shutter button to start shooting, or you are waiting for one of the subjects to enter the shooting range. When you press the entire shutter button, the focus may change, thus blurring the photo. At this time, we can separate the two actions of "focusing" and "releasing the shutter" and replace them with another button AF-On, which is usually located on the back of the machine near the thumb, so it is called "back button focusing"!

The moment when the key is focused after application.

(1) When you shoot a moving object.

Back-key focusing is very useful for shooting moving objects, especially when continuous shooting AF/AF-C+ continuous shooting is used. Just press AF-On on the back of the camera with your thumb, you can focus at any time and press the shutter button at the right time to shoot.

When shooting a moving object, you can use the AF-On button to lock the object, and then use the continuous shooting to fully press the shutter.

(2) When you are waiting for a shot.

Some cameras will be forced to lock exposure for half the time. If we use the back button AF-On, we can let you focus, wait for the right time, and press the shutter completely, without worrying about pressing the shutter again because of the change of light.

When you are waiting for the right time, you can use the AF-On button to focus, which can avoid locking the exposure while waiting (for some cameras).

(3) When your goal has a chance to be blocked.

Another time to apply the shutter button is when your target subject is suddenly blocked by other objects. You can continue to press the shutter button instead of pressing the AF-On button. Imagine that if you don't use the back key to focus, the focus will be on the obstacle when you press the shutter! For example, while filming a football match, another player may suddenly appear in front of the camera, which allows you to release the AF-On button to avoid focusing errors.

For example, when shooting a football match, using AF-On focusing can avoid focusing on players who are blocked.

(4) When you shoot flowers in windy conditions.

Although Manuel Focus is often used when shooting macro or flowers, if you want to use autofocus, AF-On can let you release the button after focusing, and even when it is windy, you can press the shutter button to shoot without worrying about the random focusing of the camera!

After focusing with AF-On, you can shoot at any time by pressing the shutter completely, even if there is wind, you don't need to refocus.

(5) When focusing before composition.

Another back key that is very useful for focusing is "Composition after Focus". You only need to focus once with the AF-On key, and then you can re-compose and shoot at will, eliminating the trouble of setting manual focus or pressing the semi-focus again every time.