Flats and Rotation/Focus

Sequence Generator
1

I’m using a NiteCrawler 3.0 and platesolve will usually allow 0.1° rotational error. Is this something I should be worried about during multiple nights and targets? I typically will shoot two targets a night so the rotation might be off by a little bit and same with focus as focus changes over night.

As for focus I typically take the average of the focus positions over the course of the several nights and use that one number for the focus position when taking flats. Is this ok?

2

It depends on what methods you are using to stack and stitch images, but if you use something like PixInsight or DeepSkyStacker, they are perfectly capable of compensating for a rotational error of that magnitude.