Perpendicularity Of Line Of Sight To Horizontal Axis - Pentax R-200 Series Instruction Manual

10.4 Perpendicularity of line of sight to horizontal axis

Checks
①Position a target Point A at a distance 30m - 50m away from the instrument, and sight it
with the telescope.
②Loosen 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.
③With the telescope still reversed loosen the horizontal lock screw and rotate the instrument
around the vertical axis, and sight Point A again.
④Loosen 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.
⑤No adjustment is necessary if Point B and C are aligned.
Adjustments
①If 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.
②Using the adjustment pin, rotate the reticle adjustment screws horizontally opposite each
other (see preceding page), and move the reticle to sight Point D.
① Repeat the check and make sure the adjustment is correct.
Reticle adjusting screws
47