Rear focusing system
A system where only the rear lens group moves during focusing. It eliminates changes in the physical length of the lens during focusing.
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Rear Focusing System
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Both front and rear focusing Bellows that extend to permit at least a 1:1 image ratio In addition to the features listed above, the view camera has additional features that control image sharpness and distortion.
RF (rear focusing)
Only one or more rear lens groups behind the diaphragm move during focusing. Due to the small size and weight of the group it enables faster AF. There may be a change in physical length when zooming.
Some Reisekameras were not designed as tailboard field cameras for rear focusing. Instead their focusing and all possible shift and maybe tilt movements has to be done by moving and adjusting the lens board.
The thickness error isn't a big deal to most people, but is a big deal if you use Nikon wide angle lenses with rear focusing (RF) or close-range correction (CRC). This is most of Nikon's wide angle lenses made in the past 30 years.
 See also: Rear focus, Lens, Focusing, Focus, Focal length
  
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