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photo:pentaxsmc1000mmf11

Table of Contents

Pentax SMC 1000mm f/11 mirror lens

introduction

  • this super telephoto lens introduced in ? 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

specs

  • 1000mm focal length and field of view (2.5°) at infinity focus
  • fixed f/11 aperture
  • 6 lens elements, 4 groups
  • closest focus 8m (0.2x)
  • 52mm rear filter thread
  • built-in ND filters (-1 stop, -1.5 stop, -2 stops)
  • built-in skylight, yellow and red filters
  • Pentax K lens mount
  • 119mm diameter, 248mm long and 2.3kg

reviews

photo/pentaxsmc1000mmf11.txt · Last modified: 2014/05/18 09:25 by gary1