On the iPhone, the camera has an auto focus (AF) and Auto Exposure (AE) function. When the camera moves slightly he will automatically adjust focus and exposure so that you do not overexposed photos or videos get. It is also possible to use the auto focus lock. It can be useful when shooting a person and if you want to create a blurred background which gives a nice effect.
The function AE / AF-locking has been around since iOS 4 are present, but is not yet known to everyone. Using the camera lock will not automatically focus on objects, but only on a selected object and then the exposure is well adapted.
Lock the focus is very simple. Normally when tapped with your finger on the screen with the camera app you see squares appear so that you can focus.
To the AE / AF lock to keep your trigger finger a few seconds on screen. You see a few times the square appearance. After a few seconds remove your finger from the screen and there above the shutter button, AE / AF lock. Now the focus is locked and will not auto focus.
A very useful feature, sometimes it is not nice that the camera will focus when suddenly you do not want. The lock can counter this. The lock works on both the photo and video camera.
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