El Corazon wrote:
Those are beautiful star trails.

With your imaging camera, you will most likely be best served using focal lengths between 200 and 300 mm for polar alignment.

That just has to do with the databases you use for analyzing the images. The more stars there are, the more confusing the image becomes and the longer it takes. Conversely, the smaller the FOV the more plates the solver has to interrogate until it finds the right one.
You have to find the sweet spot for your camera. The optimal FOV lies somewhere between 10 degrees and 5 degrees. That FOV ensures the pole is within the image (unless you are REALLY pointing in the wrong direction), and that there is a manageable number of stars in the image.
E.g. the Polemaster has an FOV of ~11 x 8 degrees. My guide cam of ~ 1.8 x 1.2 degrees. Both work fine for polar alignment and solve within about 10 seconds on a Pi4.

So there is a wide latitude.