I'm running a second rig with a mono camera, and decided to give narrowband another go. Elephant's Trunk Nebula is both beautiful and fascinating, with tendrils if gas and dust formed by the interplay of young stars and the surrounding gas & dust.
I used an Askar FRA 400 telescope, an ASI 1600MM Pro, OIII, SII and Ha filters. I used 15.5 hours total integration. It was processed in Siril, Starnet++ & GIMP.