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I have never seen any temperature fluctuations with the internal sensor of my EAF, but it always reads warmer than my Powerbox sensor. I have put it down to the sensor being inside an enclosure with a powered on stepper motor.
I use 2 degree temp changes to trigger focus runs, time, and filter changes. I have avoided using temperature compensation to drive automatic focus changessince I watched a cell of cold air send a sub out of focus, and the next one was in fairly good focus again as the little cold blast had passed and the focuser moved back to where it should have been.
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