| 摘要 |
The zoom of this invention comprises a first lens group having a positive refracting power, a second lens group having an negative refracting power, a third lens group having a positive refracting power, a forth lens group having a positive refracting power, and a fifth lens group having a negative refracting power from an object side in this order, wherein a zooming is carried out by moving the second and the forth lens groups, wherein the first lens group comprises, a foreside lens group having an negative refracting power, an optical element for folding an optical path, and a backside lens group having a positive refracting power from the object side, and a condition of 1.0<beta5<1.9 is satisfied, provided that an imaging power of the fifth lens group where an object distance is at infinity is beta5.
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