Hi Juan,
There must be somthing i dont understand with flats could you please explain why needing specific flats for meridian fliped images.
Erik G
There must be somthing i dont understand with flats could you please explain why needing specific flats for meridian fliped images.
Your master flat overcorrects the upper left corners of your light frames. Also you have some light frames that are rotated by 180 degrees due to a meridian flip. These frames require a specific flat and are obviously not being flattened well.
Erik G