How does AF Mode work?

AF Mode is a setting to assist you in focusing the subject. While you shooting might not be a still subject, AF Mode can "track" the subject and keep it focused. 

The first thing you need to do is make sure your camera is in AF (Auto Focus) but not MF (Manual Focus). Basic Zone such as Auto Mode, Portrait Mode, Landscape Mode and etc are advised to use Auto Focus. While Creative Zone such as Shutter-Priority, Aperture-Priority and etc are advised to use Manual Focus, but you can select Auto Focus if you want to use other AF Mode to capture moving object. 

There are three AF Mode in most DSLR, you can see the camera setting, shown in the green circle. 

1) One Shot

- The camera will Focus once when you press Shutter Button halfway. If you need to re-Focus, you have to release the Shutter Button and press halfway again. This is suitable for still subject. 

2) AI Focus

- This AF Mode is suitable for moving subject. The focus distance will keep changing while you hold down the Shutter Button halfway. The camera will first focused by the center AF Point. If the subject move away, the camera will track the subject with another AF Point.

3) AI Servo

- AI Servo got a high focusing speed. The focus distance will keep changing while you hold down the Shutter Button halfway as well. The AF Mode will automatically switch from One Shot or AI Focus to AI Servo once the subject move away from the selected AF Point. 

However, If the focus cannot be achieved, the camera will not shoot even you press the Shutter Button completely. Unlike Manual Focus, you can shoot in any time even the subject is not focused. Of course, ALL Auto Focus AF Mode consume battery.

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How to Focus in a Correct Way?

Although there are lot of people afford to buy a camera, there are still a lot of people do not know how to Focus in a correct way. Surprise?

Most of the people got a camera in their hand, and they keep shooting because they have a large capacitance memory card. Unlike the film camera, it is very expensive if they keep shooting the environment or stranger for no reason. No offense ^^. Then, when they print the photos or view in the large LCD television or monitor, they found some of the photos not clear or sharp enough. The reason they can't capture a clear and sharp photo because they do not Focus.

The red circle shows the Shutter Button. It is not just a normal button because this button allows you to press halfway to Focus the subject. Most camera will focus the subject appear at the center of the Viewfinder (or LCD monitor for compact camera).

Well, you might think that you have a smart and intelligent camera, you do not need to worry whether you need to Focus before capturing the picture. Maybe you really have a smart and intelligent camera, but you can have a clearer and sharper picture if you know the correct way to Focus, it worth a shot :)

So, use your index finger press the Shutter Button gently to feel the difference between "press halfway" and "press completely". By the way, when you press halfway to Focus, probably you will heard a beep sound once your camera focused the subject. Also, you can see the LCD monitor image from blur to clear because the camera is focusing the subject, and you are good to go. Easy :)

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