| 摘要 |
A wide-angle zoom lens is provided to obtain a high magnification by adjusting a ratio between a refractive index at a wide-angle stage and a refractive index at a telescopic stage. A wide-angle zoom lens includes a first lens group(100-1) having a negative refractive index, a second lens group(200-1) having a positive refractive index, and a third lens group(300-1) having a positive refractive index. An iris is formed between the first lens group and the second lens group. The iris is moved according to a movement of the second lens group. A magnification is changed by moving the first to third lens groups on an optical axis. The first lens group includes a first lens(110-1), a second lens(120-1), and a third lens(130-1). The second lens group includes a fourth lens(210-1), a fifth lens(220-1), a sixth lens(230-1), and a seventh lens(240-1). The third lens group includes a seventh lens.
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