In low light, late evening almost dark kind of light, and on one drizzly day, the Vortex would range targets when the Kilo's wouldn't. Even at 200-300 yds in really poor light conditions the Vortex would range successfully and the Kilos wouldn't.
That's strange because I have a sig kilo 2000 and it ranges just as well at night as it does in the day, I was ranging juniper trees by moonlight at 1400 yds a couple of weeks ago. I also have a leica 1200 and it works fine at night also. The lasers are IR so day or night shouldn't have an effect on them.
Water vapor will greatly impair a LRF, mist or fog plays hell with all of them. Water vapor absorbs IR light in the spectrum they operate so fog will pretty much shut them down.
