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More temp shift with some designs than others Ben. If your ED80 has metal tube then you'll need to focus more frequently during times of the night temp is changing the most.
With my refractor the need to focus can reduce a lot if the temp stabilises through the night. Depending on length of your subs and temp fluctuations you might want to vary between focus on filter and focus on time options in SGP. All the better if you have a reliable temp readout to trigger refocusing.
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