Night vision Scope 17 hmr

Rifle scopes, iron sights and optics. Spotting scopes and target acquisition devices.

Re: Night vision Scope 17 hmr

Post by Rod_outbak » 13 Feb 2019, 6:28 pm

IR (Infra-Red) Emitters:

It's easy to assume the IR emitter HAS to be located with the scope, but in reality, the IR emitter can be anywhere.
[probably NOT the other side of the target from you, but you get the idea..]
You could even have an IR floodlight right beside the rabbit warren, and simply sit back at distance with a NV scope, and you will see the warren lit up like a football field at night.
Other benefit of this solution, is any half-decent handi-cam with night-shot capability, would also be able to see the warren lit up, which might make life easier for initially spotting the rabbits. If you can plug the camcorder into a larger screen, you might find it much easier than peering through a scope all night...

[NOTE: The beam from an IR torch SHOULD be visible using a Handi-Cam in Night-shot mode. No reason you cant experiment with this to see how much use Night vision might be for you..]


It seems that IR emitters (basically an Infra-red spotlight for your NV scope) come in a range of wavelengths, but most will be around either 850Nano-meters, or 940Nano-meters...
[As do the IR flashes on most trail cameras...]

Any IR emitter around the 850 Nano-meter wavelength, will be visible to many animals.
We see it with some of the cheaper trail cameras we have here; dogs, roos, cows, and even sheep have stopped and stared at the camera.
Some of the cattle even came over and licked it...
[It takes about 15 minutes to clean the cow drool off a freaking trail camera...not funny when they were doing it every freaking night...]

When the IR flash fires in the dark, you can see a dull glow from the LED's. It looks like a big red eye in pitch darkness.
Some of the dingoes used to avoid the camera after seeing that flash a few times...
We even had to turn the IR flash/flood off on the wifi webcam we trialed, as the damn IR attracted a batch of moths, which THEN attracted an orb-weaver spider to build his freaking web across the front of the camera!


On the other hand, true Blacklight IR flashes/torches, are up around 940 Nano-meters, and are only visible within about 4 feet of the camera.

However, the shorter the wavelength of the IR light, the quicker they attenuate (disperse?), and so if you have both an 850nm and a 940nm emitter of say 20watts each, you'll find the 850nm emitter will throw the light further.
But it will be visible to the animals.....
Mind you; some animals wont care, and if they get used to the light, this mightnt be an issue for you.
BUT, if you have animals that are twitchy or nervous, the red glow might be enough to spook them off.

So, IF you end up sourcing a blacklight IR emitter/torch, bear in mind it will either need to be higher output than the 850nm light, or you will need to accept the shorter range of the light.

Also note that true Blacklight 12v IR floodlights are fairly hard to source (or they were when I was scouting for some a few years back).

Food for thought, and the IR floodlight concept is one I intend to mess around with in the next 6-12 months...
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