SINGLE FOCAL LENGTH LENS SYSTEM, INTERCHANGEABLE LENS APPARATUS AND CAMERA SYSTEM

摘要

A single focal length lens system comprising at least a positive first lens unit and a second lens unit, wherein the first lens unit includes a first sub lens unit E which successively comprises a negative lens element A, a positive lens element B, a negative lens element C and a positive lens element D, a second sub lens unit comprising at least one lens element is a focusing lens unit in the second lens unit, and the conditions: 1.0<|fW/fA|<2.2, 0.5

主权项

1. A single focal length lens system, in order from an object side to an image side, comprising: at least
a first lens unit having positive optical power; and a second lens unit having optical power, wherein the first lens unit includes a first sub lens unit E which, successively in order from the object side to the image side, comprises:
a lens element A having negative optical power;a lens element B having positive optical power;a lens element C having negative optical power; anda lens element D having positive optical power, wherein in the second lens unit, a second sub lens unit comprising at least one lens element is a focusing lens unit that moves with respect to an image surface along an optical axis in focusing from an infinity in-focus condition to a close-object in-focus condition, and wherein the following conditions (1) to (4) are satisfied:
1.0<|fW/fA|<2.2  (1)0.5