Cave Nebula, H-alpha (Oct. 2019)

This is 8x1800" with the Synta-ONTC 203mm Newtonian at f/4.95 and the SXVF-H9, through a 6nm Astronomik H-alpha filter.  This target is very dim.  It could use 12 hours, I suppose.  Nice area, though.  Actually none of this field is merely black sky; it is all covered with faint nebulosity.