| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an infrared lens and a far-infrared lens in which coma-aberration is excellently corrected over the whole range from the telephoto side to the wide angle side, the whole length of the lens is not long even at the telephoto side, a back focus is not long, and the whole size is compact. <P>SOLUTION: The infrared lens and the far-infrared lens each include, in order from an object side, a positive first lens group, a negative second lens group, and a positive third lens group. <P>COPYRIGHT: (C)2012,JPO&INPIT |
