Sokkia DT20C, Руководство оператора

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14
6. FOCUSING AND TARGET SIGHTING
X PROCEDURE
1. Look through the telescope eyepiece
at a bright and featureless
background.
Turn the eyepiece screw clockwise,
then counterclockwise little by little
until just before the reticle image
becomes focused.
Using these procedures, frequent
reticle refocusing is not necessary,
since your eye is focused at infinity.
2. Loosen the vertical and horizontal
clamps, then use the peep sight to
bring the target into the field of view.
Tighten both clamps.
3. Turn the telescope focusing ring to
focus on the target.
Turn the vertical and horizontal fine
motion screws to align the target with
the reticle.
The last adjustment of each fine
motion screw should be in the
clockwise direction.
4. Readjust the focus with the focusing
ring until there is no parallax between
the target image and the reticle.
&
Eliminating parallax
This is the relative displacement of the target image with respect to the
reticle when the observer's head is moved slightly before the eyepiece.
Parallax will introduce reading errors and must be removed before
observations are taken. Parallax can be removed by refocusing the reticle.