Quote:
Originally Posted by devbro
Meow
I have been eyeing to buy a thermal lens for my Desert Locust Goggle. As I was reading reviews, some people claimed that the seal on them go caput in about 4 month.
Does anyone has these lens and knows if that is the case or not? If fixing these the seals is possible and worth the try or not?
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I'm interested where you heard about the seals failing from. Im currently running thermal lenses in my Revisions, and they are roughly at the 4 month mark.
Unless the air space in-between the lenses is vacuum sealed or filled with a heavier gas like argon (and I can't find this info anywhere online), the degradation of the seals, in theory, shouldn't make any difference.
Seals generally fail and leak overtime, regardless of how good they were to begin with. If the space in-between the lenses is only filled with air at the factory, the loss of the seal won't have any affect on goggle performance, since the U value (thermal transmittance though the lens) of the lens hasn't changed. If the lens is actually vacuum sealed or filled with a heavy gas from the factory, the degradation of the seal would mean regular air has infiltrated the lens, and the U value has increased allowing heat to move through the lens more-easily, and in turn making it more likely for condensation to occur on the inside of your goggles.
With all that being said, even if you get a leak in the gasket or it fails overtime, having a dual-lens with a poor seal will always be better than a single lens, because... Thermodynamics.
I hope that's not too confusing...