This HOO composition combines 2 hours integration in Ha (12x 600s) with 3 hours in O-III (18x 600s).
Captured with C9.25 on an EQ6R, with f/6.3 reducer, off-axis guider, and asi1600mm.
Seeing was better than average, and guiding was better than expected for a somewhat low-elevation target (36 deg at meridian), averaging ~0.7" RMS per axis.
This version is preliminary. I am very slowly learning how to use PixInsight, and it's grueling work. For this preliminary version, I stacked, pre-processed, and combined in PI, then stretched and sharpened in Photoshop. I'm still working through tutorials for non-linear processing in PI and I expect that to do a much finer job with noise control and sharpening. Also experimenting with Starnet.
The attached copy is reduced to 25% and compressed for CN.
Full-res here: https://www.astrobin.com/slkdxu/D/
Thanks for looking
Edited by rkinnett, 20 January 2021 - 02:32 PM.