| 摘要 |
<p>Provided from the object side are a first group of lenses (11) having a positive refractive power and fixed to the image plane, a second group of lenses (12) having a negative refractive power and a magnification varying action exhibited when moving along the optical axis, a third group of lenses (13) fixed to the image plane and having a positive refractive power, and a fourth group of lenses (14) movable along the optical axis so as to maintain the image plane moving with the movements of the second group of lenses (13) and of the object in a fixed position from a reference plane. Hence the movement of the image due to camera shake is corrected by moving the whole third group of lenses (13) vertically to the optical axis. The size is reduced and the aberrations are small because the whole groups whose optical performance is united are decentered.</p> |
