I like watching TV nebulized albuterol pdf Apple also touts the new iPhone 5S’ as having autofocus matrix metering with 15 focus zones. This is a common feature on decent DLSR cameras and some high-end compacts. It allows the camera to split the scene into various zones, determining what the subject of focus is and adjusting metering according to where it focuses. This typically increases the speed and accuracy of focus and helps to reduce errors in auto-exposure. Where a face turns out really dark or a sunset is blown out, for instance.