Night owl optics night vision monocular11/7/2022 From my experience this quoted range is about right - it works exceptionally well, lighting up your target as if you have a powerful torch trained on it right up to distances of around 50 meters and then as you get further back the intensity slowly starts to drop off. Night Owl say that it has a maximum effective range of between 75 and 100 yards (69 and 91 meters) depending on what you are looking at and the atmospheric conditions. The way this one and indeed all the ones that I have used work is by sending out a beam of infrared light which is invisible to us, but which is detectable by the monocular and so the device uses that light just like we would use a torch, taking the IR light that is reflected back from what you are looking at and amplifying it as it would with normal light to create an image on the phosphorus screen. Sticking out of the top of the body (or side, depending on how you are holding it!) is the built in Infrared (IR) illuminator, which when turned on, enables you to see when there are no exterior light sources (moon, stars, street lights etc). If you require a fully waterproof night vision monocular, take a look at their NONM4X-MR that is designed for marine use. So if it does rain, I would personally put it away or at least make some sort of a cover if you intend to keep using it. The monocular does however look as though it would withstand light rain and a little moisture, however this is just my opinion and I did not try it out. Night Owl Optics do not mention anything to do with weather or waterproofing and as there are no seals on things like the battery compartment, I will assume that it is not waterproof.
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