![Lens](http://rack.3.mshcdn.com/media/ZgkyMDEzLzA5LzE5LzI0L2xlbnMuMmVkMWQuanBnCnAJdGh1bWIJNTc1eDMyMyMKZQlqcGc/8d7f842f/ed4/lens.jpg)
Human eyes are an ideal lens. They can easily shift focus between several objects in a given scene, even if those objects are located at different distances. Attempting a similar ability with a camera may require the photographer to change lenses.
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