Second mirrorless APS-C lens patent from Pentax: 18-70mm f/3.5-7.1

In addition to the 18-55mm f/3.5-6.7 lens from last week, Pentax filed another patent in Japan for a 18-70mm f/3.5-7.1 mirrorless APS-C lens:

  • Patent 2012-108333
  • Patent release date: June 7, 2012
  • Patent filing date: October 18, 2010
  • Zoom ratio: 3.92x
  • Aperture: 3.60 - 6.95
  • Focal length: 18.071 - 70.840mm
  • Half angle of view: 11.7 - 45.7deg
  • Image height: 14.24mm
  • Back focus: 2.17mm
  • Lens length: 70.23 - 100.0mm
  • Lens design: 6 groups, 3 aspherical elements
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