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 AryaX
 |  | About NightVision devices
< on 1/17/2009 1:51 AM >
|  | | | I have been reading through lots of threads about Night Vision devices that were posted here over the years and noticed that people seems to have the idea that Monocular devices are useless, they are OK if you just want to observe things from distance but if you are going to be moving around then they are no good because they tend to magnify the image and you need to hold the device in front of your eye with your hand and you won't have any depth perception so you will be bumping into walls and falling into holes and stuff like that...
-->
That is very interesting... Considering that the Military (for which these devices are really designed for) seems to have quite different idea... In military those dual tube devices are usually used by drivers and pilots, who need depth perception but are also looking at things from distance... Infantry units moving on foot, sometimes inside buildings and such nowadays prefer monocular devices because it is easier to move around without bumping into walls and falling into holes and stuff 
---->
So... First of all I would like to clarify that there are head mounted devices with 1x magnification available for civilians and of all the three types. (Binocular, Biocular and Monocular)
Binocular is the type with Two intensifier tubes and two eyepieces, Biocular is device with two eyepieces but both get same image from one intensifier tube... Mono of course is just one tube and one eyepiece...
And about the depth perception... When your looking through Night Vision device, it doesn't matter if the thing your actually looking at is one meter or 100 meters away, your eye will in any case be looking at 2D image some 2 cm or so in front of it and you need to manually focus the device to different distances like normal binoculars...) So you will not have Real depth perception no matter what type of NV device it is.
It is true of course that if your using Binocular device then each of your eyes will get their own slightly different images which can help a little and in some completely pitch-black darkness where you will see absolutely nothing with naked eye, it is no doubt better if you have Binocular device...
But on the other hand while using Monocular device, the other unaided eye can retain full peripheral vision and adaptation to the dark and so IF there is enough light to see anything at all with naked eye then it will definitely present a significantly greater advantage... (The view through Night Vision devices, ALL of them! is very narrow, kind of like looking through toilet paper roll)
The main disadvantage of using Monocular device is no doubt the quite significant strain it can have on your eyes. (while using Monocular device one of your eyes will get much brighter image than the other and both of your eyes tends to try to focus to the real object your looking at instead of the image you see in the device causing it to go out of focus. So you need to consciously keep your eyes focused to view of the NV device... And these "problems" can easily cause headache especially if your using the device continuously for prolonged period of time...)
------>
Overall... The Field of View and Depth Perception in pitch-black darkness and the
comfortability on your eyes is better with Binocular device. The Field of View and
Depth Perception in any other conditions and the comfortability on your neck is
better with Monocular device...
[last edit 1/17/2009 2:00 AM by AryaX - edited 3 times]
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manehawk
Location: NNJ
Gender: Male
| | Re: About NightVision devices
<Reply # 1 on 1/21/2009 5:27 AM >
| | | | Good write-up.
IMO, nightvision is more trouble than it's worth.
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MIAD
 
Location: Here and There NSW Australia
Gender: Male
Off The Radar
| |  | Re: About NightVision devices
<Reply # 2 on 1/21/2009 2:02 PM >
| | | | A good write up but from my personal experience (ex military, artillery) I can say that the singe monocular is by far the best. The dual causes more problems than it is worth. You do get used to the lack of depth perception, even to the point you can judge perfectly. The dual system requires you to wear a counter weight on the back of your head and is very tiring. Most drivers will generally focus one monocular on infinity and one on the distance to your map, so it doesn't really affect you much, just gives you two focal lengths to play with. With both you have virtually no peripheral vision and both are physically tiring on your neck. All up they are not worth the effort for exploring, unless you like headaches and have a lot of cash to blow
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AryaX
| | Re: About NightVision devices
<Reply # 3 on 1/21/2009 5:35 PM >
| | | | Yes... Night Vision devices definitely don't turn night into a day... You are definitely
going to see better with simple Flashlight (head mounted and/or handheld) and they
are far more comfortable... NV is only going to be "worth it" if you really need to be
able to see without being seen by others... They have many limitations...
1. Lack of any real Depth Perception with all types of NV devices...
2. Limited Field Of View. With Binocular/Biocular devices your both eyes will adapt
to the bright image and lose the "natural night vision" and so that 40 degrees or so
what you see through the device is all that you are going to see... (as opposed to
the 190 degrees or so what you might be able to see with naked eyes...)
(With Monocular device you may see something in some 140 degrees or so with the
unaided eye but the intensified view through the NV device it self is still that same
limited ~40 degrees...)
3. They display no colors and brightness of things can seem quite different through
the device (dark objects may seem white and vice-versa depending how well those
objects reflect IR wavelength...)
4. They are never truly hands free as even with head mounted devices you are still
going to have to focus the device by hand to the varying distances your looking at.
(Just like with any regular binoculars...)
5. Even the lightest Monocular devices still weights and you will start to feel it on
your neck after while...
6. ...
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Allva
  
Location: San Antonio, Texas
Gender: Male
I have my moments.
| | | Re: About NightVision devices
<Reply # 4 on 2/15/2009 11:25 PM >
| | | |
Now at Walmart toys.
Life is hard, but it's harder when you're stupid. |
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micro
 
Gender: Male
Slowly I turned
| | Re: About NightVision devices
<Reply # 5 on 2/15/2009 11:40 PM >
| | | | I think it's safe to say that if you require night vision devices in order to explore a building then you're doing it wrong.
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AnAppleSnail
Location: Charlotte, NC
Gender: Male
ALL the flashlights!
| |  | | Re: About NightVision devices
<Reply # 6 on 2/16/2009 12:27 AM >
| | | | Posted by micro
I think it's safe to say that if you require night vision devices in order to explore a building then you're doing it wrong.
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You mean I shouldn't be walking around in a building that is perfectly dark with active sight-based security patrolling constantly? I'm hurt! Why, I shoot with only film just so that I won't be given away by a DSLR backlit screen.
Achievement Unlocked
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Raticus
  
Moderator
Location: Tyler
Gender: Male
Ratus exploricus abandonae
| | Re: About NightVision devices
<Reply # 7 on 2/19/2009 4:28 PM >
| | | | Posted by Allva
Now at Walmart toys.
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Actually own 2 sets of these that we play "war" with in the backyard (my son and I). I'd likely never use them in a building because I don't typically explore at night, but they work surprisingly well.
Edit: Let me add that I've never looked through a more professional or military set of goggles, so I don't know how they compare. I guess I should say that they work surprisingly well for what I expected.
[last edit 2/19/2009 4:30 PM by Raticus - edited 1 times]
Wise men speak because they have something to say; Fools speak because they have to say something. |
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bourbonbaby
Gender: Male
| | | Re: About NightVision devices
<Reply # 8 on 2/19/2009 5:06 PM >
| | | | Posted by AnAppleSnail
Why, I shoot with only film just so that I won't be given away by a DSLR backlit screen.
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You can turn the screen off you know.
http://www.flickr.com/photos/wojtek/ |
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y2knowledge
Location: Dallas, TX
Gender: Male
| |  | | | Re: About NightVision devices
<Reply # 9 on 2/24/2009 4:43 PM >
| | | | Did anyone ever mention that when looking through nvg's and then taking them off right away for any reason make's for having your eye's to adjust to the darkness? Granted it's prolly dark as hell (hence the need for nvg's) but if you wanted to switch to a lamp or if a sudden bright light source comes into play then your screwed, specially if your found and trying to get the hell outta dodge.
But then I'm sure at that point it doesn't matter 
My name is Legion, for we are many... |
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maxx233
Location: Redding, Northern California (CA)
Gender: Male
| | Re: About NightVision devices
<Reply # 10 on 2/26/2009 3:16 AM >
| | | | I picked up a NV monocular with a headmount from a pawnshop for $100. Part of the justification was that I could probably use it for exploring. I've used it once for a very short period when a flashlight *might* have given me away. Probably not, but I had the NV with me, so heh ;) That said, I don't regret buying the NV one bit, I love it! If there's room in my bag and it's late night I'd probably take it (not the whole setup though, just the monocular,) but I practically speaking (psssh!) it's not difficult to live without on an explore
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DarkAngel
Gender: Male
His operating system is unstable.
| | Re: About NightVision devices
<Reply # 11 on 3/27/2009 9:58 AM >
| | | | Posted by MIAD
A good write up but from my personal experience (ex military, artillery) I can say that the singe monocular is by far the best. The dual causes more problems than it is worth. You do get used to the lack of depth perception, even to the point you can judge perfectly. The dual system requires you to wear a counter weight on the back of your head and is very tiring. Most drivers will generally focus one monocular on infinity and one on the distance to your map, so it doesn't really affect you much, just gives you two focal lengths to play with. With both you have virtually no peripheral vision and both are physically tiring on your neck. All up they are not worth the effort for exploring, unless you like headaches and have a lot of cash to blow
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Other thing to remember. Military NVG's are gen 3+ where as the stuff you can for 100-500 dollars is gen. 1 stuff. I.E. You arent going to be able to see more then a few yards at worst and it will have a bit of a fish eye effect.
You can get longer distances if you have an IR illuminator going with your set, however it is bad to use those in groups. IR light can, and will fry the living hell out of your retinas.
Just my .02
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