The helical system in which the Auto Micro Nikkor is mounted has an extra-long extension range. The lens can be focused from infinity to 9 1/2" (film plane to subject), producing a 1/2-life size image. Use of the M ring, provides a second focusing range from 1/2 life to 1:1.
Deeply recessed into the mount, the Auto Micro Nikkor optics are effectively protected against stray light. All glass-air surfaces are hard-coated.