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-Afocal lens - lens attachment that alters the focal length of the camera lens without disturbing the distance between the lens and the film plane.
-AF Sensor - the sensor used to detect focus.
A parafocal lens, after having achieved focus at a telephoto focal length, offers the possibility of zooming back to a wide angle length, meanwhile maintaining focus on the subject. Non-parafocal lenses have to be re-focused after zooming back.
 See also: Photography, Photographer, Focus, Back, Image
  
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