| 摘要 |
<p>A zoom lens which is so easily constructed as to bend an optical path and has a high zoom ratio, wide angle of view, small F value, very small aberration, high optical specification/performance, and which comprises a first lens group (G1) fixed at power varying, a second lens group (G2) having a negative refractive power and moving at power varying, a third lens group (G3) having a positive refractive power and moving at power varying, and a fourth lens group (G4) having a positive refractive power and moving at power varying and during focusing, wherein the first lens group (G1) comprises a negative meniscus lens having its convex facing an object, a reflection optical element (P) for bending an optical path, and a positive lens, and the moving path of the fourth lens group (G4) is in a opposite direction to the moving at power varying of the third lens group (G3) at infinity object point focusing.</p> |
