4. ANGLE MEASUREMENT
4-2
If parallax is created between the crosshairs
and the target when viewing vertically or
horizontally while looking into the telescope,
focusing is incorrect or diopter adjustment is
poor. This adversely affects precision in
measurement or survey.
Eliminate the parallax by careful focusingand
diopter adjustment.
Focusing knob
Telescope eyepiece (Diopter ring)
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