Pentax R-315EX(NX) - Manual (Page 31)

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3.8 Attachment and detachment of tribrach
The tribrach of R-322EX, 323EX, 325EX, 322NX, 323NX, 325NX, and 326EX are detachable
from the instrument if required when replacing the instrument with a target or unit prism
for example.
[Detachment]
First loosen the recessed screw with a screwdriver, then rotate the locking knob until the
arrow points upward, and lift the instrument up.
[Attachment]
Mount the instrument on the tribrach with the guide marks coinciding, and rotate the
locking knob until the arrow points downward.
The guide and guide mark must be fitted to attach the instrument.
When the tribrach does not need to be attached or detached or instrument is to be
transported, tighten the recessed screw with a screwdriver to fix the locking knob.
Instrument
Tribrach
Guide mark
Tribrach locking lever
Recessed screw