After upgrading to SG Pro 3.0 with an option for individual event gains I decided to lower my ASI1600 139 gain settings as my plan was to use the gain 75 with Nebulae and gain 0 with Galaxies, both with offset 10. Yesterday evening being the first "clear" in two weeks I continued my journey with my old friend Monkey Head, starting with 5 minutes exposures and gradually increasing the integration time all the way up to 10 minutes because the mean ADU's stayed at low 300's and I didn't get any left-side separation on Histogram.
Any ideas why these ADU's don't get any higher even when I'm doubling the exposure times? With the gain 75 I was hoping to get 600 - 700 mean ADU's but as you see I didn't come even close. I'm guessing my Bortle skies are 4.5 - 5 so it's not like I'm doing this in the middle of the Kalahari Desert. And don't get me wrong, I love these longer exposures / less subs and rather process 60 pcs of 10 min subs for 10 hours than 200 pcs of 3 min subs. Just curious why I cannot get any left-side Histogram separation.
As usually - thanks,