Optical System and Image Pickup Apparatus

摘要

An optical system including: a first movement group moving along an optical axis direction at the time of focusing from an object at infinity to a short-distance object; and a second movement group provided on an image side of the first movement group and moving to an object side by an amount of movement different from an amount of movement of the first movement group at the time of focusing from the object at infinity to the short-distance object. The optical system further includes an image stabilization group.

主权项

1. An optical system comprising:
a first movement group moving along an optical axis direction at a time of focusing from an object at infinity to a short-distance object; and a second movement group provided on an image side of the first movement group and moving to an object side by an amount of movement different from an amount of movement of the first movement group at the time of focusing from the object at infinity to the short-distance object; the optical system further comprising an image stabilization group in a movement group among movement groups including the first movement group and the second group; and the optical system satisfying an expression (1) below:
m1/m2<1.0  (1) wherein m1 indicates an amount of movement of the first movement group from an infinite-distance focused state to a shortest-distance focused state; m2 indicates an amount of movement of the second movement group from the infinite-distance focused state to the shortest-distance focused state; and, as for the amounts of movement, a negative sign is given to movement to the object side, and a positive sign is given to movement to the image plane side.