由于往往是通过天文望远镜的目镜拍摄，火星的方向是颠倒的，行星的北极冠在下面。
As often seen through an astronomical telescope eyepiece, the planet's orientation is inverted, with Mars' north polar cap at the bottom.
由于目镜是可更换的，望远镜根据需要可以有不同的放大率。
Since eyepieces are interchangeable, a telescope can be used at a variety of powers for different applications.
或者，你还可以将目镜的焦距除以望远镜的焦比来得到出瞳尺寸。
Or, you can calculate the exit pupil by dividing the focal length of the eyepiece (in mm) by the focal ratio of the telescope.
从本质上讲，目镜的视场光阑与望远镜有线性关系。
Essentially, the field stop of the eyepiece encompasses a linear field of view from the telescope.
虽然雨水不能损坏这具望远镜，但落在目镜上的雨滴会令望远镜中的景物模糊。
Water won't hurt these binoculars, but raindrops on your eyepieces will definitely spoil your view.
此款定焦式的望远镜没有个性化的目镜曲光镜调节。
This binocular is of fixed-focus type and has to be used with eye-glasses by anybody with visual defects.
使用一个低倍目镜(50倍以下)使织女星位于望远镜视场的中央。
Center Vega in the field of view of the telescope using a low-power eyepiece (Under 50x).
廉价望远镜附设可扭上目镜的太阳滤镜也是不安全的。
Solar filters designed to thread into eyepieces that are often provided with inexpensive telescopes are also unsafe.
廉价望远镜附设可扭上目镜的太阳滤镜也是不安全的。
Solar filters designed to thread into eyepieces that are often provided with inexpensive telescopes are also unsafe.
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