| 摘要 |
PROBLEM TO BE SOLVED: To provide a zoom lens that can give good optical performance while including a wide angle range and a standard focal distance range, and can meet demands for further reduction in size and weight. ! SOLUTION: The zoom lens includes, successively from an object side, a first lens group G1 having a negative refractive power as a whole, a second lens group G2 having a positive refractive power as a whole, a third lens group G3 having a negative refractive power as a whole, and a fourth lens group G4 having a negative refractive power as a whole. Upon varying magnifications from a wide angle end to a telephoto end, an air gap between the first lens group G1 and the second lens group G2 decreases, an air gap between the second lens group G2 and the third lens group G3 increases, and an air gap between the third lens group G3 and the fourth lens group G4 varies. Focusing from an infinite distance object to a short distance object is carried out by moving the third lens group G3 in an optica |
