| 摘要 |
The present invention provides a wide-angle lens and a wide-angle lens unit capable of minimizing any decrease in resolution accompanying temperature variation capable of reducing chromatic aberration of magnification. Among four lens groups in a wide angle lens (20), a third lens group (13) has positive-power glass lenses, while the other lens groups have plastic lenses. The third lens group (13) is a cemented lens in which glass lenses (23, 24) are cemented. A fourth lens group (14) is a cemented lens in which a positive-power plastic lens (25) and a negative-power plastic lens (26) are cemented together. The plastic lenses (25, 26) are aspheric lenses. |
