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photo:minolta500mmf8

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Minolta Rokkor RF 500mm f/8 mirror lens

introduction

  • this super telephoto lens introduced in 1977 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)
    • 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
  • there are 2 versions:
    • Rokkor RF (newer version)
    • Rokkor-X RF

specs

  • 500mm focal length and field of view (5°) at infinity focus
  • fixed f/8 aperture
  • 6 lens elements, 5 groups (multicoated)
  • closest focus 13.1'
  • mm filter thread but mount turns when you focus + mm rear filter
  • mm diameter, mm long and g

reviews

photo/minolta500mmf8.txt · Last modified: 2014/05/17 13:37 by gary1