| 摘要 |
A compact yet low-cost zoom lens system being particularly suited for use with small portable information terminal equipment is provided. The zoom lens system includes, in order from an object side thereof, first, third and fourth lens groups G1, G3 and G4, respectively, that have positive refracting powers and a second lens group G2 that has negative refracting power. Lens group G1 remains fixed during zooming and lens groups G2 and G3 move during zooming and lens group G4 is movable during zooming. the zoom lens system should satisfy condition (1) regarding the power of lens group G3, condition (2) regarding the amount of movement of lens group G3 during zooming condition (3) regarding the composite power of lens groups G3 and G4, and condition (10) regarding the actual value of the back focus.
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