Night Optics Argus 740 4x Gen 3 Gated Night Vision Scope - Manual (Page 10)

CONTRAST REVERSAL
Night Vision Devices detect light that cannot be seen by the human eye. This light is often
referred to as being in the near-infrared light spectrum. The existence of this light and the
manner in which it reflects is not normally visible to the naked eye. For this reason, objects
that normally appear lighter than their surroundings may appear dark against a light
background. In addition, the output image of the Night Vision Device is dependent on the
reflective quality of the objects the operator sees in the viewing area. Objects that appear
light during the day but have a dull surface may appear duller when viewed through a
Night Vision Device. All of these factors must be taken into account when utilizing a Night
Vision Device for observation or navigation purposes.
DEPTH PERCEPTION
Night Vision does not present normal depth perception. Use extreme caution when using
a Night Vision Device where reliance upon depth perception is important.
FOG AND RAIN
Night Vision Devices are very responsive to reflected ambient light; therefore, fog or heavy
rain can reflect too much light toward the Night Vision Device and may seriously degrade
its performance.
HONEYCOMB
This is a faint hexagonal pattern throughout the image area. This effect is more noticeable
under high light conditions. Do not be concerned - the honeycomb effect is an inherent
characteristic of all high-amplification night vision systems that incorporate a microchannel
plate in the intensifier.
BLACK SPOTS
These are cosmetic blemishes in the image intensifier. They do not affect the performance
or reliability of a night vision device and a number of sizes are inherent in the manufactur-
ing process.
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NIGHT VISION CHARACTERISTICS