Deep-sky images vol. 3: a refined technique for higher quality results

It&rsquo;s been a bit over a year since my last astrophotography post highlighting galaxies and a bit over two years doing serious astrophotography.&#xA;Even though my rig has been nearly static, with the exception of adding an Antlia ALP-T 5nm Ha+Oiii filter to retire the Svbony and its impressive Oiii halos and replacing my flexible spider vane with a rigid one including better adjustment screws…