| 摘要 |
<p>A zoom lens includes, in order from an object side, a first lens unit (G1) having a positive refractive power, a second lens unit (G2) having a negative refractive power, a third lens unit (G3) having a negative refractive power, and a fourth lens unit (G4) having a positive refractive power. During change of magnification from the short focal end to the long focal end, the first lens unit (G1) is stationary, the second lens unit (G2) is moved to an image side, the third lens unit (G3) is moved, and the fourth lens unit (G4) is stationary. A positive lens, included in the fourth lens unit (G4) or the first lens unit (G1), satisfies the condition formulas: 1.40 < n d < 1.65; 65.0 < ½ d < 100.0; and 0.015 < P g,F - (-0.001802 × ½ d + 0.6483) < 0.060, and the first lens unit (G1) includes a diffraction plane and satisfies the condition formula: 50 < fdoe/fl < 200.</p> |
