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Message: <blockquote data-quote="Troubador" data-source="post: 3258113" data-attributes="member: 109211">DennisYou are assuming that each side of the bins are at the same temperature and a lot of the time you would be right to do so.But there are circumstances where this doesn't apply.I have caused fogging on one side only by holding just one side of a pair of bins, with my fingers aroung the eyepiece for several minutes and then going outside into the cold. The side that I had been holding got fogged on the outside of the eyepiece.On many other occasions I have been observing through the bins and then lowered them a little to look with the naked eye and my breath coming out of my nose fogged just one eyepiece. Actually I have even done this during cleaning when looking just through one eyepiece to ensure I had cleaned away a greasy fingerprint, I found I hadn't, lowered the bins from my eye to look around for a microfibre cloth and when I looked again I had fogged the eyepiece with my breath. Grrr!Lee</blockquote>