| 摘要 |
<p>An attachment lens system (10) to adjust magnification has a housing (20) with an optical system (22). The housing (20) has a mechanism (36) to secure it to a stereo visual system (12) and to position the housing (20) in front of the stereo visual optical system. The optical system (22) is an afocal system including at least two lenses (90, 92) which are adjustable to adjust focal length of the entire system. Also the housing (20) includes a mechanism (24) to lock the lenses (90, 92) in position once they have been adjusted.</p> |
