Autofocus (AF) System

All cameras come with autofocus system. There are basically two types of autofocus system. Single AF allows the camera to focus on the object once while the continuous AF allows continuously focusing on the object and it is especially useful on moving objects. To achieve autofocusing, there are some points on the camera. Depending on the camera models, these points can range from 3 to 51. Some models also allow you to manually choose one of the autofocusing points to achieve selective focusing. If the auto focusing fails to detect any object, you can switch to manual focus. Manual focus allows you to do selective focusing also by either manipulating the len focusing ring (in SLR) or some setting that are found in compact camera. There is an AF assist beam available in most cameras that allow autofocusing possible in low light conditions.

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