Have you ever just stepped into the field and had that big buck suddenly materialize out of nowhere? You haven't been hunting more than ten minutes and there he is. You raise your rifle and look through the scope, only to find it fogged over due to condensation. No, it's not on the inside; the vapor is on the outside.
I have a question. When you know it's going to be very cold out when you start hunting, do you leave your rifle where it's warm and dry or do you leave it in the cold (and dry)? I've experienced the condensation issue when I step out into the cold and my scope instantly fogs over for a short time. As soon as it becomes the same temperature as the outside, the fog disappears and I'm back in business. It has nothing to do with the quality of your optics... it's just a condensation issue. Maybe you don't expect to see animals for the first half hour or so, but if you do, do you ever think of this issue?
Inside or Out?