| 摘要 |
A zoom lens unit includes: a positive first lens group (L1); a negative second lens group (L2); and a p i+1 < 5.0, in which r i and r i+1 are curvature radii of lens surfaces S i and S i+1 in the lens construction, respectively, the lens surfaces S i and S i+1 being "i"th and "i+1"th lens surfaces, respectively, counted from the object si
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