How Gx Rangefinders Work - Leupold GX-1i3 Operating Instructions Manual

HOW IT WORKS
The Leupold GX series of rangefinders emit a series of invisible, infrared energy pulses that
are reflected off the selected target back to the optical unit . State-of-the-art circuitry and
precision computing circuits are used to calculate the distance instantaneously by measur-
ing the time it takes for each pulse to travel from the GX rangefinder to the object and back .
Surface texture, color, size, and shape of the target all affect reflectivity, which in turn
affects the maximum range of the instrument . As a rule of thumb, brightly colored targets
are much more reflective than darker targets, with black being the least reflective color .
A shiny surface is more reflective than a dull surface . Smaller targets are more difficult
to range than larger targets . Light conditions, haze, fog, rain, and other environmental
conditions can all affect ranging performance . Any factor which degrades air clarity will
reduce the maximum effective range . Bright light shining directly on the lenses reduces the
effectiveness, producing shorter maximum ranges than those possible on darker (overcast)
days . The steadier the GX unit is held, the greater the maximum distance .
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