Pentax ETH-310 - Manual (Page 40)

40
6.4 Inclination of reticule graduations
Inspection
Set an object point A on the line of sight through the telescope.
Move point A to the edge of the field of view by adjusting the
telescope tangent screw (point A’).
No adjustment is necessary if point A moves along the vertical line of
the reticule. If the point A does not move along the vertical line of the
reticule, it needs adjustment - Consult with your dealer.
1
2
3
A'
Vertical line
Line of sight axis