M42, as known as the Great Orion Nebula.
I took this photo over two nights (4h+ total exposure) and processed it as HOORGB composite - 1mn sub-exposures for HOO and 30s for RGB. Took from a class 5 bortle site.
Gear used : Sony a7iii (3200iso) camera - William Optics Zenithstar 61ii (360mm) refractor - SkyWatcher Star Adventurer equatorial mount - Optolong L-eXtreme light pollution narrowband filter.
Softwares used : Siril, Photoshop.