Thank you guys, now that i think about it more, you are all probably correct, although i do have a dew strap for the lens, i think what has happened is this.
The observatory is pretty warm and stays at about 8-9 degrees, and i did have the dew controller on prior to opening it up, but the outside air was only 2 degrees, this is why it probably fogged up badley on the first image run until it reached temp out side.
Thanks again.
Leon
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