IC697CPM925RR

IC697CPM925RR

 

IC697CPM925RR

 

當(dāng)焦距數(shù)值算出后，如果沒有對(duì)應(yīng)焦距的鏡頭是很正常的，這時(shí)可以根據(jù)產(chǎn)品目錄選擇相近的型號(hào)，一般選擇比計(jì)算值小的，這樣視角還會(huì)大一些。

球面像差(Spherical aberration)

一般球面鏡片光線在進(jìn)入鏡片后到焦平面時(shí)在其邊緣部份比中央部份容易產(chǎn)生嚴(yán)重的折射與彎曲，此現(xiàn)象會(huì)導(dǎo)致銳利度知對(duì)比的降低及光斑的產(chǎn)生而使得影像品質(zhì)下降，而且光圈越大越嚴(yán)重，所以以收光圈的方式是可以改善這種情況，但是無法完全消除。而此種因球面 鏡片所產(chǎn)生的像差稱為球面像差。

非球面鏡片（Aspherical）縮寫ASPH，ASP

【公　司】： 廈門泰尼電氣有限公司
【主　營(yíng)】： AB、GE、施耐德等各類PLC產(chǎn)品
【價(jià)　格】： 電議
【發(fā)布人】： 張亮
【電  話】： 18030028083
【所在地】： 福建 - 廈門
【座　機(jī)】： 0592-6809819
【來　源】： 供應(yīng)信息 > 電工、電氣 > PLC
【Q　  Q】： 2314094943

 

是因應(yīng)鏡片的球面像差會(huì)降低影像品質(zhì)所以設(shè)計(jì)來改善此一現(xiàn)象的鏡片。其設(shè)計(jì)的原理是改變邊緣部份的折射率使其能將光線能投射到同一焦平面上。

慧型像差（Coma / Comatic Aberration）

故名思義就是其圓點(diǎn)的像差型狀像慧星的成像品質(zhì)，這是球面像差經(jīng)過矯正后在其畫面周邊最常見的現(xiàn)象。慧型像差可是由收小光圈得到改善。

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