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photo:sigma600mmf8

Table of Contents

Sigma 600mm f/8.0 mirror lens

introduction

  • this super telephoto lens 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

specs

  • 600mm focal length and field of view (4.2°)
  • fixed f/8.0 aperture
  • 3 groups, 6 elements (including mirror), multicoating
  • closest focus 1:3 macro
  • 86mm front filter thread
  • rear section filter holder, drop-in type (with 22.5mm exclusive filter)
  • screw on sun-shade / lens hood
  • 90mm diameter, 135mm long and 753g (compare this with 255mm and 1.3kg for a 400mm refractor style lens)
  • ~50% heavier and bigger than the Olympus OM 500mm f/8.0 mirror lens

reviews

photo/sigma600mmf8.txt · Last modified: 2014/05/17 16:10 by gary1