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10.3 Manually Sighting the Target
The procedures of sighting the target manually without using Auto Pointing function are explained in this
section.
• When sighting the target, strong light shining directly into the objective lens may cause the instrument to
malfunction. Protect the objective lens from direct light by attaching the lens hood.
Observe to the same point of the reticle when the telescope face is changed.
PROCEDURE
1. Focus on the reticle
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 focussed.
Using these procedures, frequent reticle
refocussing is not necessary since your eye is
focussed at infinity.
2. Sight the target
Use the Sighting collimator to bring the target into
the field of view. Turn the vertical and horizontal
Jogs for fine sighting adjusting.
3. Focus on the target
Turn the telescope focussing 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 until there is no parallax
Readjust the focus with the focussing 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 refocussing the reticle.
Sighting manually
When sighting manually, set "Track Setting" to "None" in <Search/Track>, then use the Sighting collimator
to bring the target into the field of view. When the target is in the field-of-view, use the Jogs to make fine
adjustments and accurately sight the center of the prism.
It is recommended that a slow Jog turning speed is used for greater stability when performing fine
adjustments.
10. TARGET SIGHTING AND MEASUREMENT
59
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