I'm sure someone has asked this but nothing came up on the search;
I borrowed a friends new to him rifle with a nice 3-9 leupold scope. The day before I used it, It absolutely poured. He managed to shoot a buck after hardly anytime of being in the woods. the next day I used it, and it was a real nice day, after sitting in the woods for 30 mins, I looked down the scope and couldn't see a thing. The inside was completely covered in condesation. It will go away if I warm up the scope with my hand but, still makes it real difficult to hunt.