Back focusing and front focusing refer to the tendency of a lens - or sometimes the camera body - to focus slightly behind (back focus) or slightly in front of (front focus) the intended subject when using autofocus.
â†' Brockhaus Konversations-Lexikon (1895), picture table "Photographie II", simple front focusing model
â†' Meyers Großes Konversations-Lexikon (1908), picture tables "Photographische Apparate", several sophisticated front focusing Reisekameras ...
When near 1:1 subject/image ratio, normal front focusing won't work. All that happens is that the image size changes. Back focusing works to a degree, but the real answer is to focus by moving either the whole camera or the subject.
6 kit lens, with its comparatively heavy front focusing element continues to hold the camera back.
No matter if you shoot Canon, Nikon, or something else, chances are you have encountered situation when camera lens combination focuses slightly ahead or behind intended target. This focus weirdness is known as: 'front focusing ...
 See also: Focus, Lens, Photograph, Photography, Focusing
  
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