Here is a pair of ‘going deep’ images of the Orion Nebula region, one a (Ha alpha, OIII) rendition, the other a (SII, Ha alpha, OIII) rendition. I posted an H alpha-OIII rendition based on the same data about 2 years ago, but since then I have recorded the new SII data, and also learnt new image processing work flows. I like to think that these two images are an improvement on my previous effort; probably they are just different. Many hours of long exposures were required to go this deep and achieve a satisfactory SNR.
https://flic.kr/p/22tHrP4
https://flic.kr/p/JU9zpk