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photo:mto-11ca

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MTO-11CA / Rubinar 1000mm f/10 mirror lens

introduction

  • this super telephoto lens introduced in ? is a modified Maksutov catadioptric mirror lens, and as with all such mirror lenses, share the following characteristics:
    • manual focus
    • fixed aperture (in this case f/10)
    • 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
  • the Rubinar 1000mm f/10 is a later version of this lens

specs

  • 1000mm focal length and field of view (2.5°) at infinity focus
  • fixed f/10 aperture
  • lens elements, ? groups
  • closest focus 7.3m (24')
  • M116 rear filter thread
  • M42 lens mount thread
  • 122mm (4.8“) diameter, 250mm (9.8”) long and 1.9kg (4.2lb)

reviews

photo/mto-11ca.txt · Last modified: 2014/05/18 10:09 by gary1