RCW 58, a large but faint ring nebula in Carina. Especially faint is the OIII shell. RCW 58 originates from a Wofl-Rayet star. WR stars are huge, perhaps 20 solar masses. I have not imaged this before. Needs more data as always, but is too low for me now.
Skywatcher 300PDS 12" F5 Newtonian, ZWO ASI 183mm Pro, Svbony Ha and OIII 7nm narrow band filters, Modified NEQ6 Pro with 2146 x 30 sec subs, mostly unguided. Stretched hard cos it's really faint.
Full at Astrobin --->
https://astrob.in/1asww7/0/