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I don't understand Night Vision Device usage

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/10/2009 at 12:00
Ick View Drop Down
Optics Professional
Optics Professional

Joined: October/08/2008
Location: Pennsylvania
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Points: 817
I guess this is an accessories quesiton....
I have a question about this type of setup that I have observed many places.  Exmple:

I have noticed this several times and it is clear that I really don't understand optics.
Specifically, this area of the optic where the NVG is showin AFTER the scope.....

That is a night vision device, correct?
Doesn't that setup have the SCOPE magnify the DISPLAY SCREEN on the night vision device? Like looking at your TELEVISION from your couch through binoculars. All it does is magnify the screen, and make it reveal the grainy nature of the screen.  It doesn't really make distant objects appear larger.  Do I have that correct?

Does that kind of a system really work? Shouldn't the night vision device be between your eye and the scope, not the other way round? Perhaps that item shown here is a different kind of night night vision device, but do I have that coorect?
I did notice somewhere that a lot of scope systems have the night vision as an integral part of the scope... so perhaps things are moving that way in terms of technology?
I have noticed, like at the NRA convention in Tennissee (or was it KY, I forget) that many of the NVGs mount on brackets on kevlar.... revealing that these types of systems do in fact have the NVG BEFORE any ACOG, Red Dot, or other optic.
Is that a photo shown above a bogus setup?
Personally I have seen these devices, and tried one on at the NRA convention center.... but have never worked with one.  Clearly they don't operate with the ease you see in Hollywood movies.... but I would imagine that they can be quite a challenge in the field.  Anyone have experience with that sort of thing?
I was impressed with the headgear at the NRA convention, but the price tag was SHOCKING.

Edited by Ick - March/10/2009 at 12:01
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/10/2009 at 12:47
silver View Drop Down
Optics Master
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Joined: November/04/2005
Location: United States
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Points: 2291
You could do it that way to keep the scope in place.  It does not work that great. You have to keep the scope turned down low as possable.  You are on track with your estimation of how it works.
You really want a dedicated rifle with a night scope.   
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/28/2009 at 11:42
Oldtrader3 View Drop Down
Optics Journeyman
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Joined: May/16/2009
Location: WA (state)
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Points: 445
I believe that if you read the engineering material on some of these scopes, they are magnifying available light, reflecting it and directing it into a conventional scope objective lens.  I don't believe that they contain a CRT device.  If this is the case you are magnifying (photons) light made coherent, directly reflected and focused, similar to a mirror lens.
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