To create true night vision, the ND-3 Subzero™ Laser Designator uses the same patented green laser technology as the standard ND-3® series. However through innovative engineering and equipped with a unique circuitry enabling the DPSS 532nm green laser to now operate at temperatures as low as zero degrees Fahrenheit without loss of power.
The patented Rotary Optical Collimator uses a system of 9 fully multi-coated lenses that allowing full adjustment and control of the beam diameter and intensity to focus light where needed most. Rotating the collimator ring to minimum creates a bright micro beam of green laser light visible up to 3 miles. Rotating the collimator to more open settings provides plenty of illumination to light a trail at night or “paint a target” at up to 250 yards.
If you are a law enforcement or military professional who spends most of your time in warmer climates, such as 40 degrees Fahrenheit or above, we recommend using the standard ND-5® or ND-3® Series. However if you are normally spending your time in rough and cold weather conditions in temperatures of 40˚ F. and below, and looking for a compact, light weight and reliable source of light, then look no further… … the ND-3 Subzero™ is your choice.
Research has proven that green light is the most visible to the human eye (See Chart) and requires the least amount of eye adjustment at night. An eye that has adapted to daytime conditions generally has a maximum sensitivity around 555nm. Compared to the color red which optical spectrum is around 630 – 650nm our eye is closer to the Green region of the optical spectrum at 510 - 530nm.
Hunting and Wildlife Observation: -Allows wildlife viewing at long distance.
Laser beam is visible up to 3 miles providing pin point rescue location
Beam diameter is easily adjusted to be a light source for night hiking.