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photo:nikon2000mmf11

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Nikon F Reflex-Nikkor 2000mm f/11 mirror lens

introduction

  • this rare super telephoto lens was 1st introduced in 1970 and is a catadioptric mirror lens, and as with all such mirror lenses, share the following characteristics:
    • manual focus
    • fixed aperture (in this case f/11)
    • virtual elimination of chromatic aberration as uses mirror rather than lenses
      • also means focus position for infrared photography is the same as for light photography
    • central mirror:
      • allows much more compact lens length as the optic path is reflected internally twice
      • by necessity, blocks some of the light and thus causes:
        • decrease in image contrast
        • characteristic “doughnut” shaped bokeh imagery in out of focus areas
  • Nikon stopped making mirror lenses in 2005

specs

  • 2000mm focal length and field of view (1.2°) at infinity focus
  • fixed f/11 aperture (a 10“ f/10 telescope in astronomic terms)
  • 5 elements in 5 groups
  • closest focus 18m
  • no lens hood
  • rear built-in filters
  • 262mm diam x 598mm long and 17.5kg

reviews

photo/nikon2000mmf11.txt · Last modified: 2014/05/17 13:28 by gary1