Pentax patent for a 70-200mm f/2.8 lens

Pentax filed a patent 2012-189817 in Japan for a 70-200mm f/2.8 lens:

  • Patent filing date: October 3, 2010
  • Zoom ratio: 2.82
  • Aperture: 2.9 - 3.0
  • Focal length: 70.21 - 198.32mm
  • Image height: 21.64mm
  • Lens length: 296.16mm
  • 17 images lens group configuration 14
  • 4 ED elements
  • 2 low-dispersion elements
  • Internal zoom and f focusing
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