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4.2 FOCUSSING AND SIGHTING
1) Use the peep sight
to point the
objective lens
at the target.
2) Gradually turn the eyepiece
until just before the reticle cross-
line becomes blurred. (Fig.4.6)
Fig.4.6
3) Use the horizontal fine motion
screw
to center the target
in the field of view. Turn the 2-
speed focussing knob
to
focus on the target. (Fig.4.7)
Fig.4.7
4) Looking through the telescope,
shift your eyes slightly in the hor-
izontal and vertical directions.
5) If there is no parallax between
the target image and the reti-
cle, preparations for measure-
ment are complete. If there is
parallax, repeat the above pro-
cedure from step 2) in order to
refocus the reticle.
※
If there is parallax, measure-
ment errors may result, so
make sure to adequately focus
the target.
2
8
13
7
9
Summary of Contents for C300
Page 1: ...SURVEYING INSTRUMENTS C300 C310 C320 C330 自動レベル Automatic Level 取扱説明書 OPERATOR S MANUAL ...
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Page 56: ...第 4 版 05 0806 4th ed 05 0806 Printed in China 2004 SOKKIA TOPCON CO LTD ...