Auto focus

Auto focus is the ability of a camera / lens system to automatically adjust the focus of the lens via a motor attached to the focus group of the lens. It is a feature of digital cameras that allows them to focus correctly on a subject. It enhances the quality of the photo over fixed-focus cameras and allows for close-up (or the even closer macro shots).

Phones use passive auto-focus with contrast measurement. This means that the camera needs contrast to focus and have problems focusing on a blank wall or in low light conditions. Some phones can use their camera LEDs as a focus assist light to help deal with the latter case.

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Touch focus

Touch focus just uses your touch to choose the area of contrast on which to base focus. The auto mode just decides that for itself. There's nothing physically different with the actual focus process.

In touch focus devices, the user can select which part of the image the camera should focus on by touching the corresponding object in the viewfinder. Touch focus is available only in cameras with a touch screen.

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