Well-said Okanogan. An Australian hunter, later a customer, observed a common problem similar to the experiment you describe above. Transiting in an air-conditioned vehicle (cool scope and surfaces) then hopping out into warm, highly humid air, the scope would fog right up. It would of course be temporary, but if you hopped out to shoot, it was vexing.
I can't imagine the little insulative value of the ScopeShield helped dramatically, but I have not heard back from him. It certainly didn't hurt.
We had not thought of a Michael's style sealing disc as an approach. Gotta love the campfire!
