Newcon Optik NIGHT VISION ATTACHMENT NVS-33 - Manual (Page 26)

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In order to get the maximum quality of night picture
through the daytime riflescope, we recommend using
riflescope magnifications from 3 to 12.
6. Aim the rifle to an object and focus the objective
of device with the knob (7) (Fig.1) on its top
until you get maximum sharpness of the
observed picture.
Observation and identification range provided by the
night vision riflescope attachment NVS-33 depends
on the ambient illumination, atmospheric
transparency and contrast between the target and
background. Identification range increases in
conditions of higher illumination, in moony night
with external light sources of illumination, or if the
target is located in front of light background (sand,
snow). The identification range decreases in
conditions of low illumination, low atmospheric
transparency, or if the target is located in front of
dark background (plough-land, trees, etc.).