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Kenko/Tokina 400mm f/8.0 mirror lens


  • this super telephoto lens introduced in 2012 is a catadioptric mirror lens, and as with all such mirror lenses, share the following characteristics:
    • manual focus
    • fixed aperture (in this case f/8.0)
    • 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


  • 400mm focal length and field of view (?°) at infinity focus
  • fixed f/8.0 aperture
  • 6 elements in 2 groups
  • closest focus 1.15m giving 1:3 macro
  • 67mm filter thread but mount turns when you focus + 30.5mm rear filter
  • supplied with 30.5mm Skylight, ND2, and ND4 filters as well as front and rear lens caps and a soft lens pouch
  • 74mm diameter, 81mm long and 340g
  • T2 camera mount
  • ~$229


photo/tokina400mmf8.txt · Last modified: 2014/05/17 20:55 by gary1

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