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10 CHECKS AND ADJUSTMENTS
10-4 Perpendicularity of Line of sight to horizontal axis
Checks
q Position a target Point A at a distance 30m - 50m away from the instrument,
and sight it with the telescope.
w Loosen the telescope lock screw and turn the telescope until a point is sighted
at a distance roughly equal to that of Point A. This is Point B.
e With the telescope still reversed loosen the horizontal lock screw and rotate
the instrument around the vertical axis, and sight Point A again.
r Loosen the telescope lock screw and turn the telescope until a point is sighted
at a distance equal to that of Point B. This is Point C.
t No adjustment is necessary if Point B and C are aligned.
Adjustments
q If Points B and C are not aligned, mark Point D at 1/4 the length of the BC,
from Point C in the direction of Point B.
w Using the adjustment pin, rotate the reticle adjustment screws horizontally
opposite each other (see preceding page), and move the reticle to sight Point
D.
e Repeat the check and make sure the adjustment is correct.
30 - 50m
30 - 50m
q
e
w
w
r
A
B
D
C
PENTAX R-300 (p65-88) 10/30/02 11:11 AM Page 69