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I had the centre of the glass fog up a month or so back on a warm 99% humidity night. I'd been scratching my head trying to work out why the edge of the field would focus but not the centre, so pulled the camera off to see what was wrong. It was definitely on the outside of the nose piece.
My heater arrived from Theo during the week. Last night and tonight were both extremely humid and I had no problems. Until the cloud rolled in.
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