Nice work Peter . Love the colour and the fine little details, in and around the core . The 150 esprit must be a beast . I have recently purchased a 120 esprit and it was a lot larger than I though . The scope is built like a tank
Try integrating with the HDR composition process in PI. You can adjust the mask growth and threshold to include more or less of the shorter exposures. I tried it with a similar set of exposure lengths on M42 and it did slightly improve the detail in the core, but it was very subtle. I suspect the process is better with a much greater difference in exposure lengths than I had.