From: "Greg Crawford" <gc
	Question(MentoringRequired)
Date: Sat, 1 Apr 2006 22:06:15 +1100
Date: Sat, 1 Apr 2006 22:06:15 +1100

>If your focus changes during the night, surely your focal length has changed,
>due to exposure/contraction of your optical tube, 

Sorry, I meant to say, "due to expansion/contraction of your optical tube..."

- Greg


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