| 摘要 |
An inner focus zoom lens is, sequentially from an object side, constructed of a first lens unit exhibiting a negative refracting power, a second lens unit exhibiting a positive refracting power, a third lens unit exhibiting a negative refracting power and a fourth lens unit exhibiting a positive refracting power. Focusing from a long distance object to a short distance object is performed by integrally moving the second lens unit and the third lens unit toward an image-surface direction. Alternatively, an inner focus zoom lens is, sequentially from the object side, constructed of a first lens unit exhibiting a positive refracting power, a second lens unit exhibiting a negative refracting power, a third lens unit exhibiting a positive refracting power and a fourth lens unit exhibiting a positive refracting power. The focusing from the long distance object to the short distance object is effected by integrally moving the second lens unit and the third lens unit toward the image-surface direction.
|
