Types Of Focusing
These article illustrates the common types of Focusing available on Cameras.
1. Manual Focus
As the name implies, this mode requires the user to manually adjust the lens for a focus. Some older SLR such as the Pentax P30 and Nikon FM2 are purely manual focus machines. For some reasons, certain photographers consider the ability to use manual focussing as a benchmark for good photography skill .
2. Single Shot Autofocus
This mode allows the lens to automatically focussed on a stationary subject. Typically, a light press to the shutter button activate this function. Most modern DSLR and digital compact cameras have this mode. The disadvantage of these is that once the autofocus is not working, using the camera can be difficult or even practically impossible.
3. Continous Autofocus
This mode allows the lens to continuously re-adjust its focus on a moving subject. Typically, a half-press on the shutter button while keeping the subject within the scene activates this function. When the shutter button is fully pressed, the camera will capture the shot. Not all modern cameras have this function.
Autofocus does not work under certain conditions. These include scenes that are dimly lighted or where there are little or no areas of contrast. Under these conditions, we will have to switch to manual focus mode.
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