Stefan I use Imerge & yes, the seeing wasn't the best. Pays to shoot longer than normal & stack less in that situation. I generally capture 1700 frames per panel & stack 15% in good seeing, 10% in average seeing & 7-8% in less than average seeing. BTW it was 6 panes for the disc & 6 for the proms. I capture the proms at completely different settings to the disc.