[Down Range Pain]

anyone?

help?

[Xakk]

If Im not mistaken, its simply a double paned lens. It has air trapped in between the two panes which creates insulation. This means that it takes longer to heat up or cool down the lens which means less fogging up. Its like a double pane window. I myself have found the Invert Avatar mask to have a great anti fog lens. Living in Louisiana, its mandatory.

[D.B.D]

Agreeing with Xakk, it is dead air space between the lense.

[I.K.E.]

Yup...that's the way I remember it. It is all about fog control.

[stinkfingr]

yup, there is a very small gap between the lenses, andit has a seal around the outside edge of the lenses that traps the air in there. if the seal breaks or gets old and cracks, then it just becomes a double single lens. what really helps is the trapped air between the two lenses

[DVLCHLD]

A thermal lens is two lenses seperated by a thin foam seal around the outside edge with a gap in between them that's about 1/8". When the lenses are put together I think they create a vacuum in the space between the lenses. Hot and cold cannot travel through a vacuum. This keeps the lens from fogging. They work great but the second that seal developes a leak the lens is usually screwed.

My friend and I were sitting in a bunker at the top of Omaha Beach at D-Day Oklahoma waiting for the game to start. Right when they blew the whistle the seal on his thermal lens went bad and his whole lens fogged up. You couldn't see his eyes. lol. It was pretty funny but he was screwed. lol.

We ripped the 2nd lens out and tossed it and tried to find someone with some anti-fog on them but couldn't and his lens just kept fogging. He had to walk all the way back to the JT vendor booth and buy another lens, install it, and walk all the way back into the game.

Ahhh, good times. lol

This post has been edited by DVLCHLD: 23 March 2010 - 05:07 PM

[stinkfingr]

how can a foam seal keep out air ?

[DVLCHLD]

It's very dense and I believe has more rubber in it than foam but it looks like foam.

[Invictusone]

Well that pretty much covered all the bases.

[I.K.E.]

Gonna have to disagree with the vacuum. I'll look into it.....but considering that a true vacuum can crush a car, the two lenses would be touching each other and thus would have no space between them, nullifying the anti-fog effect you describe.

That's based on logic.....now I'm gonna go research.

[ger]

Lets not get too technical here IKE. The airspace created between the two lenses isn't a true "perfect vacuum" because that's only a theoretical situation, one has never actually been created.

The point is, a thermal pane lenses acts just like a thermal window on your house. Thermal windows rarely, if ever, fog because of the insulation properties of the air space between the two panes.

[I.K.E.]

ger, on Mar 22 2010, 09:11 PM, said:

Lets not get too technical here IKE. The airspace created between the two lenses isn't a true "perfect vacuum" because that's only a theoretical situation, one has never actually been created.

The point is, a thermal pane lenses acts just like a thermal window on your house. Thermal windows rarely, if ever, fog because of the insulation properties of the air space between the two panes.

Ok.....but even a partial vacuum crushes things. The point is that the vacuum is far too powerful for plastic (polycarbonate) lenses to withstand.

Further, household windows do NOT employ a vacuum. Many use plain old air trapped between the panes to act as an insulator. However, many windows now are being charged with various gasses that insulate better than air.

This website (thrid para) supports the idea that there is an air pocket in the lens rather than a vacuum. However, I've not yet found a very strong authority source on the subject.
http://www.guide2pai...face-masks.aspx

Regardless it is the gap between the lenses that does the trick.

[Silent-7]

As long as we're being technical, vacuums don't crush things. Unopposed atmospheric pressure crushes things.

But I agree, there has to be some air in between the lenses. I wouldn't be suprised if it's a bit below atmospheric pressure, making it a partial vacuum, but there's got to be some gas in there.

This post has been edited by Silent-7: 22 March 2010 - 09:29 PM

[1-I]

thermal lenses are the leftover remains of ancient cyclops giant knee caps.
those knee caps are removed from ancient sky cave and then treated with unicorn powder and elf spit to create an intangible field of pure negative fog energy.

that or a wizard alien made em..


that science crap you are all blabbering about, since when has science ever proven anything

[stinkfingr]

1-I, on Mar 23 2010, 08:59 AM, said:

thermal lenses are the leftover remains of ancient cyclops giant knee caps.
those knee caps are removed from ancient sky cave and then treated with unicorn powder and elf spit to create an intangible field of pure negative fog energy.

that or a wizard alien made em..


that science crap you are all blabbering about, since when has science ever proven anything

science is a beautiful thing .... and didn't somebody JUST say something about spending too much time in their computer seat ??? lol

V83JR2IoI8k EgKczdKdnKM

This post has been edited by 1-I: 23 March 2010 - 07:22 AM
Reason for edit: no edit, just got off the heavy bag and floor exercise and have just read this post, PSSSFFFFTTTPPPPP :P