The so called „Black-Eye-galaxy“ sports a large prominent dark marking adjoining its central core. In contrast to its relatively bland spiral arms it is a striking visual object under a dark sky. The appearance is supposedly caused by a merger with a smaller galaxy.
I struggled to suppress straylight by the 5 m binary star 38 Comae Berenices from beyond the field of view. So I tried to make the background as black as possible only to discover that part of the „straylight“ in fact is a whisp of quite prominent IFN (Integrated Flux Nebula) nearby. So I accepted the distracting glow of 38 Com and left the IFN in the background.
There were setbacks during the change to N.I.N.A., forced by the installation of the „Dual Rig“. N.I.N.A. has a plugin enabling synchronized sequences (and synchronized dithering) of multiple parallel setups.
Of 40 luminance- and RGB-frames respectively I had to discard 42 because focus was missed or the synchronization failed and elongated or double stars were produced. It was a fight with N.I.N.A., with the result of better programmed sequences afterwards.
Synchronized dither still sometimes is unstable.