Then using another convex lens and a micrometer eyepiece the altered parallel rays is focused, and the imaging size of line pair of collimator imaged on the another convex lens is measured.
用一辅助凸透镜与一测微目镜进行平行光束的会聚，测出准直管玻罗板线对在辅助凸透镜焦平面上所成像的大小；
The viewfinder eyepiece has a built-in –1 correction lens (suitable for normal vision).
取景器的目镜是一片-1的矫正镜片（适合大多数普通视力）。
Some methods suggest that the camera be removed and a reticle eyepiece be used – not quite an option for those using camera lens for astrophotography.
有些方法是要将相机换上一个十字目镜， 但用相机镜头拍摄的人一般没有换上目镜的方法。
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