Some Narrowband Horsing Around

I obtained some additional narrowband filters to compliment the Ha filter I've been using for a while now. The new filters are OIII, which admits light around the the 501nm wavelength only and and SII which admits light around the 672mm wavelength only.


Whilst these filters do not render "photo-realistic" colours that the eye might perceive (if the human eye was sensitive enough to discern the colour of deep sky objects), it's fun to experiment with different colour combinations by assigning various colours to the Ha, OIII and SII channels.


My first attempt at this is illustrated below, though cloud and haze severely degraded both the OIII and SII sub frames.


The images below were produced by assigning  RGB channel colours to Ha, OIII and SII respectively in the first image, then SII, Ha, OIII in the second (the "hubble palette").