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photo:minolta800mmf8

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Minolta Rokkor RF 800mm f/8 mirror lens

introduction

  • this super telephoto lens introduced in 1972 and redesigned in 1981 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

specs

  • 800mm focal length and field of view (3.2°) at infinity focus
  • fixed f/8 aperture
  • lens elements, ? groups (multicoated)
  • closest focus
  • mm filter thread but mount turns when you focus + mm rear filter
  • mm diameter, mm long and g

reviews

photo/minolta800mmf8.txt · Last modified: 2014/05/17 12:33 by gary1