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Autofocus with mirror lock on SCT
I am setting up a Meade LX200R 8'' SCT with mirror lock and a orion guidescope on top of it and want to do automated imaging.
I have always imaged with refractors and now I am trying an SCT, I have a question. I understand the mirror has to be locked after focusing to avoid focusing shift during the night. If mirror is locked, no further focusing can be made right? How does people do focusing during the night with an electronic focuser?
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