Use caution when employing a laser after dark against an enemy outfitted with night vision equipment. Most infrared laser rangefinder beams can be seen in night goggles and weapon sights, dramatically compromising your location.
Lazing over water generates some unique considerations. Bushnell engineer Tim Carpenter has noticed that humid air absorbs laser wavelength light like a sponge. I've found that laser beams can bounce invisibly off water onto a distant object, then back, and yield an incorrect range. All it takes is a water-filled pothole for this to happen.
And finally, here's a useful visual demonstration I devised to help sniper students understand how various objects absorb, deflect, diffuse, or reflect laser light. Take a high-intensity SureFire flashlight and point it at a
pine tree; see how diffused the light is? The same thing will happen to an IR laser beam. Now, point the SureFire at broadleaf bushes, especially wet ones, and see how much more it's illuminated by the beam. The same for a solid surface. And if the beam's wider than the object, you end up with wasted light, which reduces the maximum measurable range. This works wonders in helping students understand how to get the most out of their lasers.
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Deer hunting is an interesting thing that reminds you of those golden old ages of 19th centuries, where a handsome hunk well equipped with all hunting material rides on horse searching for his target animal either for the purpose of displaying his masculine powers or for enticing and wooing his lady love.