| 摘要 |
<p>A retrofocus type of zoom lens includes: in order from the object side, a first lens group (G1) having negative refractive power and including a negative lens sub-group (G1n) and a positive lens sub-group (G1p); a stop (St); and a second lens group (G2) having positive refractive power and includes a sub-lens group (G2s) having positive refractive power as a whole and arranged on the most object side, said sub-lens group (G2s) including a first lens (L21) having positive refractive power, a second lens (L22) having negative refractive power, and a third lens (L23) having positive refractive power. The second lens group (G2) is moved to the object side along the optical axis for zooming from the wide angle end to the telephoto end with moving the first lens group (G1) to make the correction of image plane position.</p> |
