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最近在学做变焦系统，遇到了一些问题，思索了很长时间仍没有很好的解决，请教各位朋友以下几个问题：1.孔径光栏怎样设置？开始我将光栏固定在某个组元上，但变焦到某些焦距时系统变得不可使用了，显然将光栏固定在某个组元上是不行的；我尝试着分别为低、中、高不同倍率时设置不同的光栏位置，效果还是不错，但在这几个点附近的倍率的数值孔径好象没变化了；还有，按照陶的书说在变焦过程中应尽量使各个组元的通光口径保持不变，有利于像差校正，但在自己做的实例中，中倍时的通光口径却变得很大，改变各组元的焦距、初始倍率好象影响不大，是什么原因呢？2.变倍过程中的渐晕问题，无论我怎样改变各组 元的焦距、初始倍率的取值，都没法避免渐晕。那么在目视系统中允许的最小渐晕数能取什么值呢？附件是我做的一个变焦高斯系统的ZMX文件，里面都有上述问题的体现。<br /> 谢谢您耐心看完，更期待您的指点迷津！<br /> <br /> <br /> <br /> <br /> <br /> </div> <div class="postmsg"><br /> <br /> 4组元,1,2,3是变焦核,不能放光阑,应当放在补偿组后,后固定组之前.<br /> <br /> <br /> <br /> <br /> </div> <div class="postmsg"><br /> <br /> 大哥，光栏放在后固定组之前、补偿组之后的话，高倍时前组的通光口径会变得很大啊！<br /> <br /> <br /> <br /> <br /> </div> <div class="postmsg"><br /> <br /> 是的,前组直径比变倍组大约3倍.<br /> <br /> <br /> <br /> <br /> </div> <div class="postmsg"><br /> <br /> 那这样也不行啊。前组变得太大的话，抛开光学像差校正的考虑，机械结构上也很难实现。看来固定在后组也不行，况且如果固定在后组的话，它的通光口径应该基本保持不变的，因为它只能取一个值哦。<br /> <br /> <br /> <br /> <br /> </div> <div class="postmsg">请有变焦镜头设计经验的高手指点一下，非常感谢！</div> <div class="postmsg">我个人认为楼主这个高斯解是可用的，至于目视系统，渐晕系数不小于35%就行。<br /> </div> <div class="postmsg">放后固定组<br /> 短焦时有渐晕，但是应该可以控制在合适范围内</div> <div class="postmsg">谢谢各位朋友的见解，我再思索、消化一下。</div> <div class="postmsg">嘿嘿，顶起来…………<br /> <img src="static/image/smiley/Tiger/05.gif" smilieid="143" border="0" alt="" /><img src="static/image/smiley/Tiger/05.gif" smilieid="143" border="0" alt="" /></div> <div class="postmsg">嘿嘿，顶起来…………<br /> <img src="static/image/smiley/Tiger/05.gif" smilieid="143" border="0" alt="" /><img src="static/image/smiley/Tiger/05.gif" smilieid="143" border="0" alt="" /></div> <div class="postmsg">如果我只考虑高、中、低三个倍率的话，好象现在这个高斯解会更合理些，但其它倍率也考虑的话，感觉又不太对劲了，崩溃啊！</div> <div style="height200px;"></div> </div> </div> </div> </div></div> </div> <!--autocomment filter by maxnum--> <div class="ft_wp"> <div id="ft" class=" cl"> <div id="flk" > <p> <a href="http://wpa.qq.com/msgrd?V=3&Uin=20600600&Site=光电工程师社区&Menu=yes&from=discuz" target="_blank" title="QQ"><img src="static/image/common/site_qq.jpg" 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