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There are several temp compensated focusers out there, the Optec TCF-S I have springs to mind, but the robofocus has temp options. I dont use the temp function, its a ***** to calibrate, but it maybe worth it on a refractor. SCT focus is less critical.
Maxim DL has a filter focus offset function, so you only focus each filter once, enter the difference focus count in the filter set up, and thereafter you only focus on one filter and the offset is applied automatically to the others as you use them. Saves a lot of time.
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