To all,
I'm trying to flat-field the Milky Way image I posted in late May. Given that it was taken at such a low angle, I believe Symmetries are the way to go since the gradient was caused by the thickening atmosphere rather than light pollution. The framing of this image is about 4 degrees offset from the true horizon. First, what symmetry should I use (e.g. H or D)? Second, how do I input a 4 degree offset from the true horizon? I assume, I will need to use this offset for each point. Right? Any other suggestions would be greatly appreciated.
Thanks,
Wade
