Thx Rob for your reply. Maxim DL gave me the FITS in this size. When I open this files on my computer in opservatory in Pixinsight or Maxim DL, the file are without errors (pls. see photo attached). I think that the problem was this: I copied folder from computer in opservatory to an external memory, than I downloaded this folder on my home computer for elaboration. This is were problome came out - during coping folder.