While some of the least expensive digital cameras have only automatic focus, ie focus the camera do all the work on your topic in the best possible, most SLR Digital’s three focus modes: manual, single auto focus and continuous auto focus. All three will be addressed here.
With manual focus, the camera remains out of the focus equation and you, the photographer, any decisions on this. This is done by setting different buttons or actually attached to a focusing ring, which rotates the lens of the camera. For those who like to have complete creative control of the finished product, this is the best focus mode.
In Single AF mode, the camera automatically focuses when the shutter button down all the way either to download a photo or half to push the focus lock to shoot. This mode is useful when shooting static objects.
In continuous auto focus the camera continuously focuses on the objects in the photo. In this mode, the camera continuously corrects the focus as the objects from the camera changes. This mode is useful when you shoot photos of moving objects like a race car during a race or airplanes during an air show. You can hold down the shutter button halfway and continuously move the camera to follow the object. The camera will continuously keep the object in focus.
Like any other feature automatic and manual focus modes have their advantages and disadvantages. The first step with them is to your advantage to understand how they work and what it was designed. The next step is to experiment shoot photos using different focus modes and different types of objects and see how the camera behaves. Once you have done this, you will be ready to instinctively use the best focus mode for each photo situation.

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