| 摘要 |
The invention is directed to a compact rear converter lens that has a high zoom ratio of the order of 1.7 to 2.0, is corrected in terms of various aberrations in a well-balanced manner, is little affected by production errors, and is made so compact that it can be built in a compact camera. This rear converter lens that has a negative focal length comprises three lenses or a first lens of negative power, a second lens of positive power and a third lens of negative power, conforms to 0.3<f1/f3<1(1) 0.23<d4/ SIGMA d<0.6(2) where f1and f3 are the focal lengths of the first and third lens, d4 is the axial air space between the second and third lens, and SIGMA d is the axial space from the first to sixth surface of the rear converter lens, and is attached on the image side of a master lens system ML.
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