爱丝套图,大尺度私房照,露大胸美女,美女被草动态图,性感美女私房写真,美女gift,办公室肉明星美妇

首頁 產(chǎn)品 新聞 介紹 留言
 

供應(yīng)雙凹透鏡

產(chǎn)品信息

產(chǎn)品詳細(xì)

Biconcave LensesBiconcave Lenses have negative focal lengths. They are often used to expand light or increase focal lengths in existing systems. Specification: Material: Crown glass, high index glass, or custom materialsFocal length: +/-1%Diameter: +0.0/-0.03Center thickness: +/-0.05Centering Accuracy: 1"Figure (sphericity): 1~3Surface Quality: 40/20Coating: Optional

聯(lián)系方式

相關(guān)產(chǎn)品