focal ratio

focal ratio的基本解释

-

焦比

与focal ratio相关的网络例句 [注：此内容来源于网络，仅供参考]

It's just a matter of focal ratio achievable.

这只是可达到焦比的问题。

It was found that for large aperture ratios (the ratio of focal length of the primary to its aperture, as the f-ratio in modern cameras for instance), f/10 or more, the difference between spherical and paraboloidal mirrors was negligible in the performance of the telescope.

结果发现，大口径的比例（比例焦距初级到其孔径，由于架F -比率在现代相机举例来说）， f/10或更长时间，之间的差别球面和抛物面反射镜是微不足道的，在表现望远镜。

His first camera had an aperture of about 360mm or 14.5 in diameter, and a focal ratio of f/1.75. It is now housed in a museum at the Hamburg Observatory .

他的第一个相机的光圈约三百六十零毫米或14.5 ，直径，和一个焦点的比例f/1.75 ，这是现在住在一个博物馆在汉堡天文台。

The ratio of the focal length to the diameter of a lens system.

颅骨最大长度和最大宽度的比率。

The ratio of the focal length of a lens or lens system to the effective diameter of its aperture.

光学仪器的目镜上的细线、圆点、十字型细线或金属丝组成的系统。

与focal ratio相关的网络解释 [注：此内容来源于网络，仅供参考]

focal ratio：焦比

即:放大倍数=物镜焦距/目镜口径 =入射瞳孔直径/出射瞳孔直径 ---------------------------------- 焦比(Focal Ratio) 望远镜放大倍数不能无限制的增加,即目镜不能太短;最短约四毫米,主镜焦距亦不能太长,究竟焦距长度如何决定呢?

focal ratio：焦比(焦距/直径)

Focal Length:焦距 | Focal Ratio:焦比(焦距/直径) | Thickness:厚度(应该是主镜镜片厚度)

nominal focal ratio：标称焦比

nominal deviation 标称偏仪 | nominal focal ratio 标称焦比 | nominal poer 标称功率,额定功率

nominal focal ratio：标称焦距比

nominal flow rate ==> 公称流量 | nominal focal ratio ==> 标称焦距比 | nominal focal surface ==> 名义焦面

focal length ratio：焦距比

focal length 焦距 | focal length ratio 焦距比 | focal plane 焦面