Up to now, most of my efforts have been focused on putting together a decent starter Astrophotography setup and working out the kinks and challenges of my imaging workflow. Having worked through focusing, guiding, image framing (remembering to remove the bahtinov mask, lol), everything finally when well shooting the Andromeda galaxy last night. I even did my first full set of calibration frames. So as I try to decide how to begin processing this I have several unrelated questions:
I took 50, 2 minute light frames and afterwards I see a reddish cast to the second half of them. I'm assuming it is from light pollution as Andromeda got lower in the sky. Should I try to remove the cast from individual frames before stacking?
I just purchased the Adobe photography suite and I have Sequator, DSS and a trial version of APP. I have both a Mac and a Windows 10 machine. My first attempt with APP was disappointing (albeit with limited data) whereas Sequator did a better job with it. Any suggestions on where to find a good processing workflow to try? I am open to try other programs.
With the Orion nebula so prominent, I would like to gather data now for later processing. Because of the dynamic range, should I shoot it using different exposure times to get both the nebulosity and the bright inner core? I gather there are ways to combine these data to get a better image. Are there other ways to accomplish this without using different exposures?
I read where folks keep adding lights to previous sessions to improve the results. Am I right in assuming that all of the lights are shot with the same image train? How are different exposures and ISO's added together?
Thanks in advance for your thoughts.