If you are photographing fast moving subjects, particularly when they are constantly changing their distance from you, you will likely have to use automatic focusing.
An automatic focusing setting in which the camera constantly refocuses the image as you frame the picture. This setting is often the best choice for moving subjects. See also single autofocus.
Lenses using internal and automatic focusing also keep lens weight down thanks to less moving parts, and of course allow for faster focusing.
A camera setting that overrides the automatic focusing and sets it to infinity so that landscapes and distant subjects come out sharp regardless of where the camera would automatically have focused.
Important - either with manual or automatic focusing, you decide what spot to focus on. All other objects on the same plane (same distance from you) will come out sharp as well.
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Nikon 200mm f/4D ED-IF AF Micro Telephoto Nikkor Lens with Case - with 5 Year U.S.A. Warranty ...
When talking about compacts today people don't think of old compact folders but of handy cameras with several automatic features: automatic film advance, automatic exposure, automatic focusing, automatic closing of the lens cover after usage, ...
Super Sonic wave Motor: built-in lens motor provides faster automatic focusing plus quiet, smooth operation.
Storage
The type of memory card your camera's compatible, including internal memory ...
Whenever possible, avoid automatic focusing modes when shooting macro. Always opt for manual focus. Remember when checking your photos to zoom in on the LCD, or view on a computer before packing up. Your LCD can lie to you! ...
Above all else, shooting with manual focusing takes practise. The more you practise, the easier it will become. There are many photographers who prefer to use manual focusing instead of automatic focusing for most of their shots.
In general, the lenses on digital cameras are very similar to conventional camera lenses -- some digital cameras can even use conventional lenses. Most use automatic focusing techniques, ...
Alternatively, the camera may use ultrasound (sonar) and measure the time taken for the sound signal to return. This data is converted by a microprocessor into information about distance and thereby enables the automatic focusing of the lens.
and also can distort the light passing through them, resulting in a less-sharp image. To avoid the noise and vibration, many professional cameras offer a mirror lock-up feature, however, this feature totally disables the SLR's automatic focusing ...
 See also: Focus, Focusing, Automatic focus, Camera, Automatic
  
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