Extend LRS-1000 Laser Rangefinder

23.10.2010

     Since the bullet doesn’t have an ideal, “direct” flight trajectory correct range measuring between a shooter and a target defines a shot efficiency. Of course, in most cases there’s no need to calculate the distance of a shot up to 1 meter in the hunting field – an experienced shooter knowing his rifle is able to estimate an approximate distance and make corrections by sight.

     When hunting hoofed animals it is enough to put a bullet in a “killing zone” at 200m and more. However the smaller is the zone and the longer is the distance the stronger the highly precise choice of elevation correction affects the accuracy of a shot. The accuracy of this choice directly depends on the correct shooter and target ranging. Generally, nowadays there are enough optical devices (rifle scopes, monoculars and binoculars), equipped with a range-finding reticles that give a shooter a possibility to define a distance to a target.

     Working with any of them as well as with extremely popular Mil-Dot  presupposes that the shooter knows or is able to assume with exact accuracy the linear dimensions (height and width) of a target. A mistake in defining those values undoubtedly leads to an error in correcting the POA. About 20 years ago Leica and then Swarowski offered civil market devices based the on the principle of measuring distance with the help of laser beam. The cost of several thousand “those” dollars made laser rangefinders unavailable for most hunters and shooters, but in the second half of the 90s Bushnell company could offer several quite qualitative and comparatively affordable rangefinders.

    As the years went by (mostly due to the efforts of new players in the market) a model line of devices extended, some new  functions appeared, Reliability was increased, and increasing competition turned a laser rangefinder from a luxury product for many hunters into one of the hunters’ essentials. In 2010 Yukon Advanced Optics Worldwide has joined the number of manufacturers and developers of laser range finding with its device Extend LRS-1000. Constructively rangefinder Extend LRS-1000 is made by combining an optic channel with a pulsed laser emitter. Objective lens diameter is 24 mm (the same as in a receiver channel), optical magnification – 6х.
Of course, it is hardly appropriate to use Extend LRS-1000 as a full-rate observation device on a regular basis, but often it is able to replace a monocular or binocular while hunting, moreover a 7-degree FOV angle allows shooting at moving targets.

     Extend LRS-1000 is a compact device; its linear dimensions are 98x75x54 mm, and the weight with a battery CR123A – a little bit more than 200 grams. So you can carry it both in the belt carrying case shipped in the supply kit and simply in a pocket. Electronic-optical part is integrated in a durable plastic body  with a soft touch coating that provides a comfortable grip  even in wet hands. Rangefinder doesn’t slip out, the work with it can be described as tactile pleasant. Besides, a tilted rear part encourages a correct position of a range finder in front of an observer’s face. Body joints as well as a cover of a battery container are sealed hermetically (the range finder is water-resistant in a rain condition).

     Functionally the rangefinder allows making distance measurements of objects up to 1000 meters away (with ±1 meter accuracy) and making speed measurements of objects moving with the speed from 5 to 300 km/h (with ±5 km/h accuracy). And if the rangefinder makes distance measurements both in meters and yards, speed measurements – only in metric values (km/h or m/s).
Apart from single measurements Extend LRS-1000 can work in a scanning mode. One 3-volt battery CR123A is enough for making more than 3000 measurements.

     In the focal plane of an eyepiece There is an LCD display showing measuring results as well as an “aiming mark” All symbols (marks and numbers) are made by means of thin black lines, which, on one hand, are well-perceived by an observer and on the other hand do not substantially overlay an object of observation (a prevailing element in a viewing area is an actual observable object, not information). Compact dimensions and low weight (perhaps the smallest in the class), high usability, simple operation, well-considered information representation, decent speed and accuracy in measuring, readiness for the whims of nature… Taking into account all characteristics Extend LRS-1000 can be related to typical hunting rangefinders from which they first all expect operation reliability and comfort in daily use.

Alexander Smirnov