2）Adjusting the distance between eyepiece and reticle by turning diopter ring
on eyepiece (9)，stop turning until the reticle image become as clearly as
possible.
3）Centering the object into field of view by turning fine adjusting knob (8) on
telescope, then focusing by turning focusing knob (10).
4）Lightly up and down, right and left moving your eyes when observing
telescope ( Fig.3.7 ).
5）Make sure the object is quiet relative to reticle firstly, if there is no relative
displacement, then start to measure, otherwise, repeat the operations from 1).
※ Relative displacement will bring error of measurement, please prepare well
before measuring.
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