At the click of a button, these high-tech measuring devices send out a series of short pulses of invisible laser light (harmless to your eyes). This finely focused beam meets the target it is directed at and is reflected off it. The returning light, the "echo", is captured by the lens and registered by sensors in the devices. Strictly speaking, it is not the distance that is actually measured, but the time between the sending and receiving of the laser beam. Based on this time, a microprocessor then calculates the distance to one-meter accuracy and displays it on a screen in the eyepiece within fractions of a second.
On the basis of this given distance, the responsible hunter can then assess the situation with certainty and decide whether a shot is possible or not, and what bullet drop is to be expected and must be compensated for. Whether on the hunt, on the golf course or in the day-to-day life of a landscape architect, there is hardly an easier way to determine distances from 10 m to well over 1000 m quickly and reliably.
A laser beam is usually thin and tightly focused, but it nevertheless widens with distance. This beam expansion or "beam divergence" is measured in millirad (mrad). The measurement beam of the Victory RF binoculars has an extremely low beam divergence of 1.6 mrad x 0.5 mrad, i.e. a measuring spot 100 m away is about 16 x 5 cm in size. This allows very precise measurement of small objects at great distances.