I recently acquired filters to do narrow band photography. And 3 clear nights gave me a very good look at the Crescent Nebula in Cygnus. In this case, 36 x 300" Ha and 34 x 300" OIII, processed as an HOO blend, shot July 20, 21 and 22, 2019, from suburban Victoria with a ES127ED Apo refractor. Processed in Pixinsight.