Thermal imaging - 2 Questions

[stag]

1/ I've been told that thermal imaging works reasonably well in misty conditions, the lens on my image intensifier form a moisture layer on the front lens which degrades the image, does this have a negative effect with thermal imagers.

2/ I'm intrigued to know how you zero thermal weapon sights, my normal zero distance for a image intensifier would be 200yds does anyone have any "hot" tips!

 

[Libertarian0317]

Ive used a few thermals at work, all inline sights. Most thermal sights are going tyo basicly be a small tv screen you look at, esp one for optics, so some moisture will not be noticed, but if you get alot or moisture on the objective lens of you scope or camera it will make the center look blurry. best way is to get a computer mouse pad type material to wrape where the two optics join. or use a heavy sock, not only to block light form the thermal but to stop moisture from entering.
As long as you have a inline thermal sight your zero should not change, if the objective lens of the thermal is higher even slightly than the center of your day optic it will most likely shift your zero. but as tod hodnet says check everything, see if it changes your dopes and further ranges, or if it changes zero if you place the thermal on different rails where you attach it infront of your day optic.
most of mine, MUNS, UNS-T, have not changes my zero. hope this helps.