Sharpless 2-155 AKA The Cave Nebula. RASA8 with ASI533MC Pro and an Astromik L-2 UV/IR cut filter mounted in a RASA filter cell and installed where the optical window normally sits. Also using an IDAS NBZ-II anti-haloing filter mounted in a Starizona RASA filter drawer. Processed in Siril and a Mac photo editor.