国产精品永久免费10000,欧美精品一区二区三区免费,欧美在线免费看,亚洲一区二区三区播放在线,日韩免费一区二区,日韩中文字幕在线有码视频网,日韩午夜免费电影

首頁(yè) 產(chǎn)品 新聞 介紹 留言
 

供應雙凹透鏡

產(chǎn)品信息

產(chǎn)品詳細

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