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Zoom Lens System, Interchangeable Lens Apparatus and Camera System

  • US 20120162779A1
  • Filed: 12/22/2011
  • Published: 06/28/2012
  • Est. Priority Date: 12/22/2010
  • Status: Active Grant
First Claim
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1. A zoom lens system, in order from an object side to an image side, comprising a first lens unit having negative optical power, a second lens unit having positive optical power, a third lens unit having negative optical power, and a fourth lens unit having positive optical power, whereinthe first lens unit moves along an optical axis, and the fourth lens unit is fixed relative to an image surface, in zooming from a wide-angle limit to a telephoto limit at the time of image taking, andthe following condition (1) is satisfied:


  • 0.8<

    f
    I/fW|<

    1.4 



    (1)wherefI is a composite focal length of the first lens unit, andfW is a focal length of the entire system at a wide-angle limit.

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