If the target you are imaging is near the zenith (over 85 degrees), field rotation will be more significant, which can also increase the likelihood of stacking failure.Zenith field rotation can cause image streaking, elongation of star points, and even failure in image stacking. Particularly when photographing objects near the zenith, since the field rotation is the fastest, the distortion becomes more pronounced. You can use the equatorial mount mode to eliminate the issue of field rotation, achieving more stable long-exposure shots and better image stacking results.
