7RZPFJfJ I have also replied to this same question in your other post. I'm sure other can correct me on this but the visible drift rate is affected by the cosine of the declination. So at the Equator at Dec 0 degrees, Cos (0) = 1 so stars appear to move at their fastest rate. Near the Poles Dec of 90 degrees, Cos (90) = 0 so stars appear to move very slowly, traversing a small circle. So at lower declinations as you approach the celestial equator, more precise tracking is required otherwise stars produce long faster moving trails which is what you are seeing in the images. To minimise star trailing at lower declinations a shorter exposure time is recommended, whilst at higher declinations the exposure time can be increased.
