Night Vision Lens from Maglite ...

Ralf

Enlightened
Joined
Dec 5, 2002
Messages
406
Location
Heilbronn/ Germany
I found "Night Vision Lens" tactical Accessories from
Maglite. They block all IR light. "To be used with NVG
equipement" ... On the other hand there are IR-filters,
which let only IR through.

When is a "Night Vision Lens" to be used and when the
IR Filter?

Cheers
Ralf
 

beastie boar

Newly Enlightened
Joined
Dec 11, 2002
Messages
16
Location
Germany
Hi Ralf,

NV equipment (intensifier tubes) has its highest sensitivity in the near IR spectrum. Whether you put a filter on your flashlight to block IR or to block the other emitted wavelengths simply depends on the intended use.

You might want to block IR when using your flashlight without your NVE to reduce the risk of being detected from greater distances by other players using NVE (of course using a flashlight is not that great of an idea if you're trying to keep a low profile /ubbthreads/images/graemlins/wink.gif ).
A more practical scenario IMHO in which you'd want to block IR would be if you team up with other ppl using NVE to avoid blinding them at close range when you turn your light on (your NVE is off).

Blocking anything but IR gives you instant additional illumination when needed while utilizing your NVE, but avoids revealing your position to Joe Average. Of course, this won't help to remain undetected by other NVE.

/ubbthreads/images/graemlins/smile.gif
BB
 

CM

Flashlight Enthusiast
Joined
Sep 11, 2002
Messages
3,454
Location
Mesa, AZ
Blocking IR will not prevent you from being detected either with NV or without. Try using a LED light (which has very little emission in the IR range) with NV equipment and you'll see what I mean. An intensifier is a "photon amplifier" and blocking IR is futile if you're trying to avoid detection by night vision devices. IR and the visible spectrum is magnified by NVD so blocking IR has no utility for use with NVD.
 

Ralf

Enlightened
Joined
Dec 5, 2002
Messages
406
Location
Heilbronn/ Germany
CM thats why I could not understand what
purpose the Mag kit should have ...

But a least I am not the only one :)

Cheers
Ralf
 

Frangible

Enlightened
Joined
Jun 19, 2003
Messages
789
If you use blue or violet light, it won't be very visible to Gen III tubes, their photocathode has a weak response to those wavelengths. It will still show up strongly for the other generation tubes though.
 

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