[天文观测] 2013-11-15雾里寻觅几百里,拨开云雾见艾森!! |
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Weibo: http://weibo.com/shamluck/
Photo: http://www.flickr.com/photos/jeffdai/ |
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BADMAN:目镜的表现视场的简易计算:表现视场=57.5/焦距*视场光阑(度)
举例说明一个焦距20mm的目镜,视场光阑直径是24.5mm,它的表现视场=57.5/20*24.5=70度 |
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