Zoom lens and imaging apparatus

摘要

A zoom lens consists of a negative first lens group, a stop, a positive second lens group, a negative third lens group, a positive fourth lens group, and a positive fifth lens group in this order from the object side. The first lens group through the fourth lens group move along the optical axis while changing magnification such that the distance between the first lens group and the second lens group is reduced and the distance between the second lens group and the third lens group is increased. The fifth lens group is fixed with respect to an image surface while changing magnification. The first lens group consists of a first lens, a second lens, a third lens, and a fourth lens in this order from the object side.

主权项

1. A zoom lens consisting of a first lens group having a negative refractive power, a stop, a second lens group having a positive refractive power, a third lens group having a negative refractive power, a fourth lens group having a positive refractive power, and a fifth lens group having a positive refractive power in this order from the object side; wherein
the first lens group through the fourth lens group move along the optical axis while changing magnification from the wide angle end to the telephoto end so as to change the distances among one another such that the distance between the first lens group and the second lens group is reduced and the distance between the second lens group and the third lens group is increased; the fifth lens group is fixed with respect to an image surface while changing magnification; and the first lens group consists of a first lens having a negative refractive power, a second lens having a negative refractive power, a third lens having a negative refractive power, and a fourth lens having a positive refractive power in this order from the object side.