I am usually one to work on one filter a night, however, with LRGB that changes and I will usually try to do all of them in one session.

I noticed yesterday when stacking that my light frames are not aligned with my flat frames.

I am not sure if this is a result of a faulty EFW or not but it's like the filters aren't returning to the same position. I have no way to tell that really unless I am looking at my flat frames and lights next to each other.

The flats were taken before the session if that info helps at all. In the meantime I am going to contact ZWO

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