| 摘要 |
PROBLEM TO BE SOLVED: To provide a zoom lens having a simple configuration that corrects well for aberrations of light in a wide wavelength range from the visible range to the infrared range over an entire zoom range and offers high optical performance.SOLUTION: A zoom lens comprises a first lens group Ghaving positive refractive power, a second lens group Ghaving negative refractive power, a third lens group Ghaving positive refractive power, and a fourth lens group Ghaving positive refractive power, arranged in order from the object side, and is configured to zoom in and out by changing distance between the lens groups along an optical axis. The first lens group Gand the third lens group Gare stationary while zooming. In particular, the third lens group Gcomprises a positive lens Land a negative lens Larranged in order from the object side. The zoom lens satisfies predetermined conditions to achieve high optical performance.SELECTED DRAWING: Figure 2 |
