iPhone 4 and even previous models has feature which allows you to select the focus point while taking the photograph. All you need to do is to tap your finger somewhere on the screen where you want your focus to be. Basically it tells the camera that the photograpgh should be properly focussed and clear at that particular point.
There is one thing additon to that happens when you Tap the focus point, which is camera selects that Tap point as reference for Metering (Metering is the mechanism by which camera selects how bright or dark the resultant photo should be)
Let me explain this with an example. In the following photograpgh you can notice that there are three different types of areas,
* Left side mostly bright
* Center – optimum light
* right – dark side
Now comes the selection of the point. If we tap at a darker area, camera will automaticaly make the picture brighter. If you tap at a brighter area, it will adjust the brightness and make the picture little darker. It depends on the scene and the frame you are capturing, how you want the photorapgh to be.
In the above photograph I tapped at the left side of the image thus it adjusted the light and made the left side optimum (by reducing the brightness) while making rest of the areas as dark (see right side)
In the above photograph I tapped at the right side of the image thus it adjusted the light and made the right side optimum (by increasing the brightness) while making left area as more brighter (see left side)
So whenever you are taking photograpgh using iPhone, just take care of the Tap point as it will afect your overall picture exposure.
Hope it helps !
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