[器材展示] (全文完)赛特龙极光7系列8×42双筒望远镜开光感受 |
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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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