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Taking images of fast moving subjects can be very difficult–and we’re using the term ‘fast moving’ very loosely here. A fast moving subject can be anything from a racing car coming your way at terminal velocity, to a snail trying to cross the street. Ultimately, what is fast depends on how quickly and how accurately your camera’s autofocus is able to lock on to a subject that is not holding still. Some cameras are better suited at this, while some have a hard time locking on to anything that moves only slightly.
This is one of the reasons why sports photographer usually go for high-end DSLRs, as these have the most elaborate and advanced AF systems. A very good AF system and a lens that is quick to focus are a necessity if you regularly take pictures of moving things, persons, or animals. But not every scenario that involves a subject on the move is as unpredictable as a tennis player pacing across the court. So for some situations, there is a simple but effective trick to work around your camera’s autofocus limitations: to pre-focus.