I have to recommend cooling of large EP's. Why? Coz my GS 2" SV has seagulls until it has cooled for about a half hour. After cooling I have no problems.
I find that it fogs easily when first taken outside too. Once cooled I have not had a problem with fogging either.
Mike, I don't leave the case wide open or leave the EP in the open air for cooling. I take the 2" out of it's cardboard box and let it sit in the EP box with the lid of the EP box open about 1" (2.5cm).
Works for me anyway.
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