At the very beginning of November Motorola took the camera application from the Moto X, and made it available as a stand-alone download from the Play Store, in order to make camera improvements for the future easier to deliver — instead of the ROM update way. Now that camera application is being updated with some improvements and new features, though, your phone has to run Android 4.4 KitKat (meaning Moto X phones that have received the KitKat treat, as well as the Moto G).
In addition to bug fixes, extra language support and locked exposure during Panorama capture, the new camera app introduces the ability to manually control focus and exposure. This can be achieved, as illustrated below, by dragging the bracket in the scene to the desired position in order to set focus and exposure. Sadly, focus and exposure are set together, so there’s no option, for the moment, to set the focus in a different point than the exposure measurement.
Source: Google Play