Pentax files a patent for a DA*25-350mm F3.3-5.6ED [IF] SDM lens

Similar to Nikon, Pentax filed a patent for a high-powered zoom lens DA*25-350mm F3.3-5.6ED [IF] SDM:

  • Patent application: 2011-8234
  • Release date: 01/13/2011
  • Filing date 05/22/2009
  • Focal length: 25.71-339.99mm (13.22 zoom ratio)
  • Aperture: 3.3-5.7
  • Angle of view: 4.8-60°
  • Image circle: 28.48mm
  • Back focus: 52.92-108.59mm
  • lens length: 174.86-281.04mm
  • Internal Focusing
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