Quote:
Originally Posted by sil
After mirror flip wont the image have a tiny change in focal length as a result so stacking sets would get slight doubling that youre seeing as trailing?
|
In fact there is a slight mismatch in focal length between the two groups of images. The scaling factor is about 0.999.
But even if I don't unlock the scaling in my stacking software, I don't get elongated stars. Therefore, I believe the reason was an inaccurate rotation (in the range of 0.1 degrees) before stacking.
Erwin