telun 发表于 2005-4-24 17:26:00

CCTV 4.2mm F2.0



刚接触光学设计大概三个月, 技术还很不成熟,目前在设计一款4片玻璃的定焦镜头,角度约
76度,目前结构在较大视场MTF较差,而且令我感到困惑的是在code v中relative illumination都过高,甚至出现超过100%的情形,这样是合理的吗?尝试过用macro来降低RI值,不过效果似乎不大,想请问各位高手们有遇过这样的问题吗?以及目前这样的结构有什么建议可以将大视角MTF往上提升呢?谢谢各位高手指教!

<img src="data/attachment/forum/dvbbs/2005-4/20054249243568104.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'data/attachment/forum/dvbbs/2005-4/20054249243568104.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />
<img src="data/attachment/forum/dvbbs/2005-4/20054249251784375.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'data/attachment/forum/dvbbs/2005-4/20054249251784375.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />



telun 发表于 2005-4-24 17:29:00



<img src="data/attachment/forum/dvbbs/2005-4/2005424929196896.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'data/attachment/forum/dvbbs/2005-4/2005424929196896.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />



xpwj 发表于 2005-4-25 18:37:00



对于角度大的镜头要设渐晕系数,然后你再优化会有很大改观.



xzg_fzh 发表于 2005-4-25 19:09:00



倒数第一个面改为 R< -20 mm，倒数第二个面改为 R< -15 mm 。
第一块玻璃换成 ZK10。
如果看第一个MTF图，你的像质其实并不差



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