I know its not really traditional to post unfinished / test images, but I was wondering why even with a 12nm h-alpha filter I was getting 4 minute sub exposures without trashing the frame. For whatever reason, probably the 2 hours of sleep if that I got last night and work, I changed the preset ISO from 1600 back to 100, then proceeded to freeze for a good half out in the 20 or lower temps with snow on the ground and managed to have my tripod semi freeze to the ground a bit.
I figured something was up when I plopped down the star adventurer and just basically went for it. LOL
4 min (and change) sub exposure at iso 100 with canon 50mm f/1.4 USM lens at f/2.8 and t5i
EDIT: I am still trying to figure out how to get a color image from using the h-alpha filter. Usually split the channels and use the red. Using gimp, rawtherapee
Edited by wxcloud, 13 February 2020 - 10:14 PM.