7. Loosen clamping screw and
8. Turn periscope to the right or
left, as needed, and tighten
azimuth locking knob.
9. Adjust periscope in elevation and
tighten locking lever.
Some M19 periscopes have
eyepiece. Others have automatic
focusing. Both are shown below.
10. Focus eyepiece with right and
left adjusting screws.