Other accessories include tripod , shutter release cable , adaptor ring , equatorial mounting , guiding telescope and cross - hair eyepiece 常用的设备还有三脚架快门绳摄影机接合环赤道仪式脚座追踪用望远镜及十字丝目镜等。
Af and ae automatically activated deactivated by combination of eyepiece and grip sensors . eye - start is turned onoff by eye - start switch 自动对焦及自动曝光乃全由目镜感应器及把手感应器触发启动关闭，并附设选择性眼睛启动开关掣
An eyepiece placed in the adaptor will project the prime image formed by the telescope objective lens onto the film with the resulting image magnified 在望远镜与摄影机间的接合环内加上一个目镜，便可以利用目镜将天体的影象投射至底片上。
Comprises a cylindrical tube with two right angled eyepieces fitted in opposite directions . science in different viewing field can be observed at one end of the tube 两端带有相反方向的直角镜筒，在镜筒一端能观察到不在同一视野内的景物。
Vignetting can occur due to the altered ray path , when the eyepiece ' s lenses are not large enough in diameter to allow all the rays to make it through 装饰图案可以发生是由于蚀变射线路径，当目镜的镜头是不是足够大的直径，让所有的光线，使之通过。
The eskimo make and use wooden “ eyeglasses ” with only narrow slits for eyepieces , to protect their eyes from glare reffected by ice and sonw 爱斯基摩人(现称因纽特人)制作和使用木头“眼镜” ，中间给眼睛留下很窄的缝，以保护眼睛不受冰雪反射的强光的伤害。
These glass filters can crack unexpectedly from overheating when the telescope is pointed at the sun , and retinal damage can occur faster than the observer can move the eye from the eyepiece 这些镜后减光的太阳滤镜会因阳光聚焦的高热而随时爆裂,观测者的视网膜会在迅雷不及掩耳的速度下受到伤害
The one - half wavelength out of phase caused by the specimen itself enables this light to cause destructive interference with the direct light when both arrive at the intermediate image plane at the diaphragm of the eyepiece 这种由标本产生的半个波长的相位差的光线与直射光同时到达位于目镜光栏的中间像面时会产生相消的干涉。
Like the primary mirror , the eyepiece has an optical axis , and this axis should be aimed at the center of the main mirror for best performance ? though in practice it is the center axis of the focuser drawtube that you aim at the primary mirror 目镜和主镜一样也有光轴，光轴应该对准主镜的中心? ?尽管实际上，目镜的光轴对准的是调焦筒（相当于调焦座）的中心。
The magnification of any telescope can be changed very easily by changing the eyepiece . even for the largest telescopes , the magnification is seldom over 500 , usually between 100 - 200 . thus , large telescopes do not magnify more , they only show brighter and sharper images 其实大望远镜并不是把天体放得更大，而只是提供一个较光和较清晰的影像罢了倍率是物体视大小的放大比率，例如一个原本视角直径为1角秒的物体，若放大后的视大小为30角秒，那么倍率便是30倍。
