Owl Nebula (M 97)

4 incomplete nights from March 25-30 and half a night on April 5, 2021. I shot during the Moon's bright phases, when galaxies couldn't be captured. For some reason, noticeable banding appeared in the oxygen [OIII] data—possibly due to issues with calibration frames or too low gain (though the hydrogen [Ha] data was fine). The oxygen data also suffered more from moonlight and backscatter from the snow. The processing had to be quite aggressive to pull out the outer halo without amplifying the banded noise. I should probably add a few more hours of oxygen data without the Moon and RGB stars in the spring. Resized to 50% of the original.