NGC 6888 - Crescent Nebula. Shot with Ha/OIII and SII/OIII narrowband filters.
See below for stacked and stretched, and sample sub-exposures for each filter.
Acquisition Date(s): 12-15 July 2025
Camera: ASI2600MC
Filters: Optolong L-Ultimate and Altair Astro SII/OIII 3nm
Exposures: 59x600s (L-Ultimate) and 25x600s (Altair)
Total Time: 14 hours
Processing: PixInsight
L-Ultimate - All 59x600s exposures stacked and stretched
L-Ultimate - One 600s frame
Altair Astro SII/OIII 3nm - All 59x600s exposures stacked and stretched
Altair Astro SII/OIII 3nm - One 600s frame