Good evening.
For this image I have combined previously acquired 12.5" RCOS tri-colour NB data with data captured over the past several nights using the RH305/STXL16200. Intent was to retain the much higher resolution core of the Triffid whilst adding M21 and the abundant Ha in the region to the overall field of view. It didnt take much with such a fine, fast instrument - just 3 hours Ha and 5 hours OIII. Note that the blue nebulosity surrounding the Triffid is OIII. Finally, I added just 20 minutes each RGB for star colour.
Also - new website to boot - but very much in its infancy as I continue to populate it.
https://www.martinpughastrophotograp...ulae#/m20-m21/
cheers and clear skies
Martin