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The idea for measuring the temperature is to configure the automated process for re-focus, realistically the probe can be set in most places even if for example a refractor has no access to the optical path.
For me, I wouldn't need t go to the wiring path, only look at ambient temperature as based on thermal conduction principles the optical path will eventually cool within a thermal constant.
In short, I would measure every delta at 3 degrees ambient. In turn, this could be every 3 degrees in the tube or whatever your setup will be. Eventually it will all balance out.
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