Home › Forums › Spectroscopy › Master dark frame › FITS File Error Message
30 January 2017 at 8:33 pm #577878
That error message indicates that crucial FITS header fields are missing. First out I would double check that it is definitely a FITS file which MaxIm DL created, as I know it can save multiple file types. Otherwise I think something odd that has gone on with your bias, dark and flat processing.