Newcon Optik NIGHT VISION ATTACHMENT NVS-33 - Manual (Page 12)

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5. INSTALLATION ON A RIFLE
5.1. Installation with thread usage
Your NVS-33 matches to the inner thread M52x0.75 of
the objective lens of those daytime riflescopes that can
accept daytime filters. If your scope does not match this
thread, use mechanical adapters that transform M52 into
M54, M55 or M48 threads. M52 adapter is used to
increase the depth of the thread in case if the scope
objective lens is close to the edge of the scope.
Mount your night vision attachment as follows:
If necessary, screw the corresponding threaded adapter in
the thread on the adapter ring (2) (Fig.1).
Loose the retention pin (4) by turning it counters
clockwise.
Turn the adapter ring (2) counter clockwise and screw it
into the inner thread of the daytime riflescope until stop.
Avoid applying extra strength while tightening.
1. Turn the night vision attachment NVS-33 so that the
objective focus adjustment knob (7) is located on top
2. Lock the attachment in this position by turning the
fixating ring (3) in the counter clockwise direction.