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Zoom lens having a long back focal length with vibration reduction function

  • US 6,285,501 B1
  • Filed: 01/27/2000
  • Issued: 09/04/2001
  • Est. Priority Date: 01/27/1999
  • Status: Expired due to Term
First Claim
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1. A zoom lens having a long back focal length comprising, in order from an object side:

  • a first lens group having a positive refractive power;

    a second lens group having a negative refractive power;

    a third lens group having a negative refractive power;

    a fourth lens group a having a positive refractive power; and

    a fifth lens group a having positive refractive power;

    wherein the zoom lens is designed such that when zooming is effected from the wide-angle end to the telephoto end, the interval between said first lens group and said second lens group increases, the interval between said second lens group and said third lens group changes linearly or non-linearly, and the interval between said fourth lens group and said fifth lens group changes linearly or non-linearly;

    wherein vibration reduction is attained by shifting a vibration reduction lens group consisting of said fourth lens group or a partial lens group of said fourth lens group in a direction substantially perpendicular to an optical axis; and

    wherein the following conditional formulae are satisfied;

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