Newcon Optik NIGHT VISION ATTACHMENT NVS-33 - Manual (Page 28)

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When mounted in front of the daytime riflescope,
night vision attachment NVS-33 can change zeroing
as not more than 3 cm at 100 m. This is connected
with changes in the weapon balance, light distortions
in the image intensifier tube, technological limits of
the adjustment of the night riflescope attachment. This
imprecision usually appears as fixed value and can be
easily compensated by the adjustment mechanism of
the daytime riflescope.
We recommend you to make 10-15 shots with the
mounted NVS-33 before practical using it in field
conditions. Such test will check NVS-33 by a real
shooting impact and thus will increase reliability of
the whole system.
DO NOT FORGET TO TURN OFF THE NIGHT
VISION RIFLESCOPE ATACHMENT AFTER USE!