Zoom lens system, interchangeable lens apparatus and camera system

摘要

A zoom lens system comprising a positive first lens unit composed of three or four lens elements, a negative second lens unit, and subsequent lens units, wherein the subsequent lens units include an aperture diaphragm, an image blur compensating lens unit, and a focusing lens unit, which are provided on the image side relative to the aperture diaphragm, and the conditions: 1.8<|(YW/fW)×FNOT×(fT/fW)|<4.5 and 0.001<(D1W+D2T)/fW<0.200 (YW=fW×tan(ωW), fW, fT: focal length of the zoom lens system at wide-angle limit, telephoto limit, ωW: half view angle at wide-angle limit, FNOT: F-number at telephoto limit, D1W: inter-apex distance between the first and second lens units at wide-angle limit, D2T: inter-apex distance between the second lens unit and a most object side lens unit among the subsequent lens units at telephoto limit) are satisfied.

主权项

1. A zoom lens system, in order from an object side to an image side, comprising:
a first lens unit having positive optical power; a second lens unit having negative optical power; and subsequent lens units, wherein the first lens unit is composed of three or four lens elements, the zoom lens system being provided with: an aperture diaphragm; an image blur compensating lens unit composed of one or more lens elements, which moves in a direction perpendicular to an optical axis to optically compensate image blur; and a focusing lens unit composed of one or more lens elements, which moves along the optical axis in focusing from an infinity in-focus condition to a close-object in-focus condition, wherein the subsequent lens units include the aperture diaphragm, the image blur compensating lens unit, and the focusing lens unit, the image blur compensating lens unit and the focusing lens unit are provided on the image side relative to the aperture diaphragm, and the following conditions (1) and (2) are satisfied:
1.8<|(YW/fW)×FNOT×(fT/fW)|<4.5  (1)0.001<(D1W+D2T)/fW<0.200  (2) where YW is a diagonal image height at a wide-angle limit, which is expressed by the following equation:
YW=fW×tan(ωW), fW is a focal length of the zoom lens system at the wide-angle limit, fT is a focal length of the zoom lens system at a telephoto limit, ωW is a half view angle at the wide-angle limit, FNOT is F-number at the telephoto limit, D1W is an inter-apex distance between the first lens unit and the second lens unit at the wide-angle limit, and D2T is an inter-apex distance between the second lens unit and a lens unit provided closest to the object side among the subsequent lens units at the telephoto limit.