thanks guys,
last night i noticed, when the fans were running, from the few star images i took there would be slight bloating of the star. Then upon turning them off, the star shrunk slightly in size. there were only seconds between having the fans off an on so not enough time to change the mirror temp which was within 0.2 - 0.3 degrees C of ambient temp.
Ill have to do a more extensive test on this.
thanks
Josh.
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