| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an optical system with a vibration-proof converter lens group that prevents a change in the specification before and after the attachment, is compact and light weight, and exhibits good performance before and after the attachment and during the vibration isolation.SOLUTION: A converter lens group ISC having a vibration-proof function satisfies the following conditional expressions: fis/f|>2.5, and |(ol-ok-bkd)/f|<0.04, wherein fis is a focal distance of the vibration-proof converter lens group; f is a focal distance of a main optical system; and ol, ok, and bkd are a front principal point position, rear principal point position, and block length of the vibration-proof converter lens group, respectively.</p> |
