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1·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；

2·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）。

3·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。

4·Secondly, the eyepiece and the Fourier transform lens are designed to minimize the secondary color by the ways of changing glass.

接下来，设计高光谱成像仪的准直镜和成像镜，通过更换玻璃，降低二级光谱色差。